Pregnant ??

So my boyfriend and I had sex on the 11th which was a Saturday and my period was supposed to come on the 14th which was a Tuesday but it did not show up. I also took plan b on the 14th because my period did not show up and I was nervous as it did not show any signs that it was going to come. I have never been late with it.

I also didn’t have sex for 3 years until the 1st,could that have changed my cycle??

so my question is can you get pregnant after having sex two days to your period??