We did it unprotected 😯

So a little back story my ex and i have had sex before it was always protected and i always made sure he pulled out because im in my last two years of high school i don't need a kid and i would love to pursue what im trying to do with my life more easily then doing it with a kid

But to the present i have a new boyfriend its been about 2 1/2 years since i was in a relationship and me and my boyfriend now have been together almost six months and we just started having sex within the last week and today we were just really into it and i let it happen without protection and im not worried about either one of us having any kind of STD/STI but its something i do not know a whole bunch about. Like whats the chances of precum making you pregnant? Is it more of a chance if your aound your ovulation day? Is there really anything diffrent then just having protected sex? If anyone has any information they could leave that would be great. I know everyone has their own opinion on teenage sex...but it always happens so any rude comments id rather you keep them to your self.

(I am on the pill)