Contractions after sex?

My boyfriend and I had sex a little bit ago and now I’m having contractions not bad ones but noticeable. Also when I went to use the bathroom after, there was a little bit of spotting going on with most likely left overs from just before but it had a mucus-like texture. Concerning? Or should I just monitor and take it easy for the next couple of days. I’m 33w 3d, FTM.