What is wrong with me

I had been trying to conceive for over a year and was then placed on clomid in late 2017 and got pregnant right away only to miscarry 10 weeks later. I've been traumatized by this ever since. I then tried clomid again for a few months in 2018 and nothing so I figured I'd let it happen natural. Well I missed my period 4 days ago so I took a test and bam a little very faint line. I was so happy get so scared. Today i started bleeding.... i just dont get why my body won't hold a pregnancy. Why cant I be a mom. I'm so scared I'm never gonna have the chance to be a mom.