How effective is the pill?

I started taking microlite (lowest dosage of the pill) three months ago and have very little knowledge so forgive me. I had unprotected sex last night with my boyfriend. He did not cum inside me, but, he came earlier that day and had peed before we had sex. I have only missed the pill twice throughout the 3 months, the first time in the first month, second time was over a week ago, but I made sure to take the pill both times at the same time I normally would the next day. I just want to know if I'm okay? I'm due my period this week and have been having watery discharge for a few days (before I had unprotected sex also) and slight cramping. thanks in advance