It's been a month since my period came. Took pregnancy test five times but have result is negative. Anyone have similar experience to share?

I can't be sure if I am pregnant or because my fibriod grew. I didn't had any morning sickness or food cravings for my first pregnancy. Tummy only started to grow on the 6th month. I took the test first thing in the morning too. Unfortunately all came back negative. My stress level is pretty healthy, I can still enjoy a hotpot all by myself. I also don't know what happened to my period.