Possible rape?

Hey everyone, I am new to these forums and could use some honest help. I am a 22 year old gay male, and am recently out of a long term relationship. Ever since my relationship ended, I have been on edge more than usual about hooking up. About 2 and a half weeks ago, I met another guy off of grindr and agreed to meet him out for some drinks. We met at a bar and hit it off pretty well. He was around my age (he was 24) and enrolled in a grad program at an institute in the city. I thought that he was really cute, and the conversation flowed quite easily. I would say this even if alcohol was not involved. I felt as though we genuinely got along. Throughout the night, I only had 3 beers. These beers were Kentucky bourbon ale, and have a higher alcohol content than usual beers. However, I have had them before and was not intoxicated to the point where I felt out of control of myself. I simply had a good buzz going on. We got sandwiches because we were both hungry (this was after our first 2 drinks) and then we went to a different bar for a last drink before returning to his apartment.
I had been the one to ask if I could stay over, seeing as I never feel comfortable driving anywhere after having any alcohol. Initially upon meeting him, I had no intentions to stay at his place. However, after getting to the bar and finishing my first drink, I deduced that I liked this guy and would not be opposed to having some fun/sleeping at his apartment. When we got to his place we fooled around for a bit, and then smoked some weed (another activity I partake in rather regularly). I used his bowl, but I was the one who packed it. He asked me if I wanted a water when he left the room to go to the bathroom, and I declined. He came back with a cup of water for himself, which I saw him take about 2 sips out of. When he was taking a sip, I decided that I wanted one too and I asked him if I could have a sip of his water. He gave me the glass after sipping it, and before I took a sip I asked him if anything weird was in it. He gave me a strange look and just kind of scoffed. I took two quick sips and put it on the nightstand. We did not even smoke the full bowl, but it is around this time that my memory of the night gets a little blurry. I have since tried to piece it together. The last thing I really remember before waking up in the morning was us 69'ing. I had made it pretty clear that I did not want to have sex. He seemed disappointed, but nonetheless said he was going to respect my decision. Neither of us came from 69'ing and we really did not even do it for all that long. I remember us stopping, but after that I cannot really remember much. I really do not ever remember going to sleep. I do not remember what time it was when we went to sleep either, but I do know that it was after 2am. I woke up around 7:40am with a mild head ache and was thirsty. I attributed this to the fact that I had not taken ibuprofen before going the sleep. I did not think anything was out of the ordinary. However, when I went to get my phone off of the night stand on his side of the bed, I noticed an open bottle of lube next to the nightstand on the floor. We never used lube at all throughout the entire night, and I immediately thought that it was weird. After seeing that bottle of lube, I started to get super anxious and paranoid. I am a very safe person when it comes to sex. I wear condoms with all sex partners always. The only person I have ever slept with without protection is my ex-boyfriend who I trust very much. I got my phone, laid back in bed (seeing as he was not awake yet), answered my unasnwered texts from the night, read a couple of news stories, and then dozed off again for about an hour. When I woke up the second time, he was also waking up. He was quickly out of bed and seemed quite busy getting stuff together. He said he had to meet a friend, and I was quickly ushered from his apartment. I never got to ask if we had sex or not, because to my knowledge we did not and I did not want to seem strange. So I drove home, but still could not really piece together what had happened after we quickly had 69'd. I texted him the other night and asked if we had sex or not, and he responded the following afternoon with "No, we didn't have sex" and that was all he said.
Now, I will admit that I am quite anxious in regards to contracting HIV even though I am always very safe (except of course with my ex). I guess what I am asking is, is it possible he slipped something into that water that I sipped twice? If he had, would those two sips have been enough to render me vulnerable to an assault? Like I said, upon initially waking up I had not felt as though anything was amiss. However, upon seeing that lube bottle on the floor by the bed, my anxieties were triggered. That and the fact that I do not really remember how I fell asleep. I have an hiv test scheduled the day after tomorrow, but I guess I am on this forum to get complete strangers' perspectives on if I was vulnerable to assault. Maybe I am overthinking things way too much. Because he also had a couple of sips from the water glass, which means that if he had slipped anything in the glass he would have ingested it too. I even took a sip the following morning before leaving the apartment and never felt strange throughout that day. I know this post is pretty lengthy, but if anyone can logically respond I would really appreciate it.