Am i overthinking?

So, last month I had sex two times. During one of those time, we did it two times! Like, we had sex, he came. We got ready, then we went out to eat for about 2hrs ( he also went to pee)

Got home then had sex again.

Then, a week after, I guessed my period came on May 29th through June 3rd. Then, had sex on June 4th.

So, we had sex four timed!

He wore condom and came AFTER he pulled out. Can I still get pregnant? I don’t wanna and I’ve been overthinking so much lately. Like, my lower back hurt, whenever I eat, I feel so bloated or heavy! Whenever I use the bathroom, I fart (a lot of gas, I guess?) ... I feel like I need to poo, but only am passing gas.

My period doesn’t come until June 25th!