HELPPPP could I be pregnant???

I had sex over a month ago we used condoms and everything, but he finished inside. I don't think it broke it looked just fine! I was not ovulating or close to ovulation and it was a non fertile day. I got my period 3 days later and it lasted 4 days but the actual blood flow that filled a pad only lasted 1 day. The next 3 days I just had less blood and it was brown. My periods are usually light and last about 4 days so I didn't think much of it. I got my period again this month with normal flow, blood clots and all that, it lasted 6 days BUT ppl on the internet are saying you can get your period while pregnant?????? or bleeding that looks like period and now I'm stressed... Am I just paranoid idk. I should also mention that last month when my period was shorter I was in a lot of stress for other reasons so could stress have caused a light period? One girl was talking about how she bleed for a few days each month and the pregnancy test would come back negative but she was 7 months pregnant. Is this a thing like does it actually happen??? Man I'm being paranoid I literally got my period like usual this month, it's just my period before this one that worried me a bit idk I want someone to tell me I'm being dump and ease my mind