Prometrium (progesterone) effects on upcoming cycle?

Hi everyone, I'm on my 2nd month of Clomid/trigger shot/prometrium timed intercourse monitored cycle. I'm now 14 days post-trigger so about 12dpo. I started feeling period-like cramping a couple days ago and took hpts last night and this morning.. negative :( The cramping is worsening, as if my body is trying to start my period but can't because of the prometrium (progesterone). Has anyone experienced this? Last month I felt similarly but had some spotting. No spotting at all yet this month. I'm going to contact my nurse in the morning but hoping someone has some insight! Thanks!!