cause mc ?

i’ve had 2 losses before and so my situation is that im young, i’m 19 and no doctor will do any tests on me, instead they try to push me on birth control, which i was on from 13-18, it literally destroyed me, i gained 40 lbs, my mental health was terrible, my periods because irregular and superrrrr painful and very heavy. my gynecologist just tells me everything is normal. she won’t test my hormone levels or anything. before anyone goes on about how i’m young and i don’t need to have kids please don’t. i’m married, have a good paying job and almost done my online college classes, we live on our own, and my husband is military. i have a great support system if i need it. i literally just want to know if i have issues so that i can get them fixed but my gynecologist is so unhelpful it’s frustrating. the first time i miscarried, whenever me and my husband would have sex i would get really bad cramps after and sex would be kinda painful from him hitting my cervix. the morning that i miscarried we had sex, i had the usual cramping afterwards, i went to work but the cramping never stopped. i got on a video conference and i just knew that i was bleeding i just had this overwhelming feeling. i went to the bathroom and sure enough i was spotting. i ended up miscarrying that night. the next time i was pregnant i was so scared to have sex. i put it off for days. i finally said ok and broke down during sex because i was scared i was going to cause another miscarriage. we didn’t finish that night but the next day he was fingering me and i could feel him touching near my cervix and got the same cramps. i miscarried days later. im curious if this is related. i read that a fertile/pregnant cervix is up high and feels soft so in the shower sometimes i would check and feel around for my cervix. am i causing my own miscarriages ?