Please no rude comments

So i'm on birth control (the pill and condom) i had my period or withdrawal bleed a week ago (roughly) and we had period sex quite a bit (with condom) but since then i've had extremely bad nausea, consistently for about a week It seems to be worse after eating, i was just wondering if the pill could be responsible for this i have been on the pill for a few months and never experienced this. I have read about girls still getting withdrawal bleeds and still being pregnant. Or am i just freaking out about nothing

- thanks guys ❤️