Hi, A Couple Of Weeks Ago, I Had Sex Like

Hi, a couple of weeks ago, I had sex like a day after my period ended & my boyfriend did not *** or anything at all, but I'm not sure if there was any pre... It was over a week until my ovulation cycle as far as my period tracker said.. We were worried so I took a plan b pill a few days after, & shortly after that, I've felt constipated. I know constipation can be a sign of pregnancy, but I've also heard that some have experienced constipation from plan b too... Can you get constipated from plan b?? & do you think it's possible that I'm pregnant?