Is It Me / Him?

Me & my boyfriend have been together for 2 years. We are thinking about having a little one someday. But we think we both are infertile. We had a pregnancy scare back in November of last year when i lost my virginity to him. I took the plan b pill & since then my period has been nothing but hell. Aftee taking that pill i didn't have a regular period not that i ever did. But i could predict when i thought it was coming. Now i have no idea it comes as it wants. I remember not having a period for like i think 3 months. & when i did it was horrible. Heavy bleeding & horrible cramps & lots of blood clots. I went to the doctors and found out i was enimic. That was the reason for my clots and extended period. But back to my ttc part. When me & him have sex he always ejaculates in me. Idk why i haven't got pregnant yet.. maybe it might be him or is it me..

I have never been to an obgyn. The thought scares me. I dont want to be told that i cant have children.. what should i do..