Second miscarriage in a year! Tips pls

Hi guys, so the short version is that I had a miscarriage back in September (8 weeks - there was no baby only an empry sac) and miscarried naturally. As recommended I waited for one cycle before ttc. Once we started again with ttc I started having pregnancy symptoms and 4 days before my pwriod was due I had a positive pregnancy test. i tested the next day but it seemed to be getting fainter. The next day it was actually negative! I am 99% sure that it was a chemical. My period came late by 2 days. It was actually heavier than a normal period and had many clots.

At first I didn't think much of it and put my mind on other things but now thinking about it I'm worried that there might be something wrong with me. Is this normal? Should I just relax and keep ttc?

Before my first miscarriage I had blood work done (progesterone) and everything came back good. Even sperm analysis was great.

Thank you all.