I’m terrified, ladies I need your opinions !!

Alright ladies , I need your opinions like seriously 😩😩😩😩

So I’m on birth control and I just started in January of 2019 and I had my period twice in February. In March my period did not come at all, I’m currently 17 days late and I took 2 pregnancy tests they both came out negative! But I’m still completely freaking out !! I had sex once at the end of February and then I hadn’t had sex until last week, I know I couldn’t be pregnant from that, cause when he came he came on the sheets. I’m just a nervous wreck right now. Had this happened to anyone that’s on BC???