I had sex the oct 15 and then I got my period the 23 to 29, I took a pregnancy test the 30 and it was negative, but suddenly Im feeling weird and I don't know how to explain it. In my period app Today said that I'm on my first fertile day, should I take another pregnancy test or a blood test, or is just my mind and body trolling me... Please Help !!

You had your period, unless you have had sex since then you're good. IT is probably an illness that has nothing to do with your reproductive bits.

I took a blood test and it was negative too.

What more do you need?