Ug... Please, advice?

Hello. I've been extremely worried ive been pregnant for two weeks or more now... Listen I had sex (pull out) two times. March 9th and 14th. I'm worried about precum, though. Not *** he wasn't close to actually going both time because they were only a few minutes. Regardless, I'm on birthcontrol but that month I missed a ton of pills and just spotted in-between as a period I guess. I took them all before I had sex on the 14th, got more the next day (I take beyaz) ever since I've been okay BUT the last few weeks I had nausea off and on. Sometimes faint and sometimes strong. I'm not sure if it was just me or my birth control... I had been super gassy/burpy but if I was pregnant it would've been like within 3 weeks on conception if even that... I'm a huge worrywart ... Oh and when I took my pills the new pack (this is my fourth month) I had light bleeding for 3 days. I'm just ahhhh confused! Right now I should have my period but it's not coming ! This is the second day... I take my bc at night... I just really want my period but I don't know why it isn't coming...