I NEED HELP !!

So i’ve been with my man for almost a year and we’ve been having unprotected sex 10 months out of the year. Now here’s where I need help, he cums in me. He doesn’t always because I hate what it does to my pH balance but anyways Ive never gotten pregnant from it so I think I either can’t get pregnant or it’s just not my time.

I decided to get birth control pills, should I have done it ?

Will it change my system and cause me to be more fertile and will I get pregnant from this change ?

I’m nervous I could be setting myself up 😭🤦🏽‍♀️