I need advice from yall:

So I’m starting to get birth control for my periods and only for my periods for 3-6 months, because I been missing my periods every two months. So like I could start my period on October and not get it till January. I’m not sexually active, because im still a virgin. However i want to do it with my boyfriend and he’s fine with it. But I don’t know if that would mess my treatment of getting my periods now monthly.

So if I have sex with proctection (using a condom) while on birthcontrol, (however that birthcontrol only control my monthly period, and doesnt proctect me during sex) will it mess up my period? and would the pills won’t work no more?

I really forgot to ask my doctor and I really got panicky when I tried to ask.