Semaglutide + Periods…

Hello everyone! I started the semaglutide shot for weight loss about 3 weeks ago. I was supposed to start my period 1 week ago but it hasn’t started. My last time of unprotected sex was in October and I did get my periods in both October and November. Is the late period a side effect of the shot or should I be testing just in case? Also, I am on oral birth control. thanks in advance!