First period after taking prometrium but negative pregnancy test?

Kr

Today was cycle day 28 and my pregnancy test was negative. I’ve been taking prometrium (200 mg progesterone) since right after ovulation, and have had major tiredness and breast tenderness for the last two weeks. I’m nervous my period is going to be monstrous because of the progesterone to boost my uterine lining. 😂😭😅 Anyone in a similar situation? How long after discontinuing the progesterone to allow a period did you start bleeding? And how bad was it?