Ovulation Constipation after Clomid?

Hi all. I'm 33, TTC #1 and I have PCOS. This is my first month taking Clomid, which I used from CD 3-7 with no side effects. Now I'm on cycle CD17 and had a couple odd symptoms this week, which is supposed to be the week I ovulate. Two nights ago I had crazy amounts of thick and slightly sticky cervical mucus (not EWCM sadly), and I rarely have any CM. Today I had bad cramps and constipation pain and pressure all day, which I've never had. Still all negative opk's, which is so frustrating! Anyone relate?