HELPPP POSSIBLY PREGNANT AGAIN😳

So I just recently got on birth control because mastitis put me in the hospital so I am done breast-feeding. I was on my birth control for three days and we had an oops. And some people say you have to wait a month some people say seven days for the birth control to work correctly and me and my husband I guess got a little too excited and he blew it in me, twice. I haven’t had a period since last June, so I don’t know when I’m ovulating or when I’m fertile. My sweet baby is only six months old. When can I test?