If I had sex 2 weeks ago on March 10th and now it's March 20th what week am I ? Should I take a test…

I'm birth control but I've been having headaches, stomach cramping, nausea, tiredness and my birth control don't give me these . My birth control was suppose to help my mood . But it also stopped my period but I still get these effects and it ain't from my birth control. I do not know where it is from

I'm having mood swings as well

Yes you can get side effects from your birth control that mimic pregnancy symptoms

So some of these can be a pregnancy symptoms

I know my period cycle is 28 days . But birth control stop it . But since then my last sex I got nausea at 2:37 am 2 weeks ago and I'm still nausea and headaches and breast tender off and on and mood swings some food gets me sick and some don't