Missed period

Hey guys I hope y’all well my period is irregular but always happens every month, during December 2020 i had a bit of brown thick blood in my undies, and the next day I had 48 hours of just spotting, close from the9th-10th of dec.

I still haven’t started my period and my boyfriend and I have been sexually active everyday for 8months with unprotected

I went to the Gynocologist and he couldn’t see anything nore HCG levels visible, during a few days after Christmas I noticed clear skin no period and constipation, iron taste in my mouth and some dizziness only for about two days. I noticed in passing a lot more gas than normal and felt quite bloated, and had flu symptoms

I took a pregnancy test twice and one had a fait line the other was negative

Please help someone