Hello, I want to tell you my situation from start.

I was virgin and grew up in a strict family, never had a decent sex education and now in my mid 20s I realise I have no idea how stuff works sometimes and the only thing close to sex ed is what my friends tell me.

I had oral sex and some rubbing with my boyfriend, of almost a year, two weeks ago(june 22) and took a day after pill  june 23, maybe as a side effect my period started june 25.

The worrysome part starts now, I finally lost my virginity this friday(july 5) but we did not have any protection. My friends say that it was my fertile days and that I would get 100 percent pregnant and should take another day after pill

What are my chances of pregnancy in this case? as I am trying to understand well so I don't have to take another day after pill in one cycle.