Missed one birth control pill could I be pregnant?

Ok so last month I missed a pill and never took it & I've been taking them since but me and my partner had unprotected sex a few times the day after I missed the pill.. And a couple of days after I was on my red pills so I took them & I got my period but could that be because it was only a few days after we had sex and it was to soon? Now it's like 3 weeks later and I went to a gym performance night on Friday and had tea there and I woke up at 1am feeling really bloated and sick and all day Saturday I still felt really sick and my back was killing me and didn't eat anything then last night (Saturday) I spewed.. Then Sunday I didn't feel sick and my back was only a little bit sore and my stomach felt crampy/heavy so could I be pregnant ? Now monday i feel fine but still wondering if i'm pregnant..Also I've had this white/clear discharge ever since a couple of days after sleeping with my partner.. Anyone had experiences like this? Please help!