Major Cramping

Amber • Have one sweet lil lady, but she would make one awesome big sister:) Trying for baby #2 for 4 years now.
So I am on my 2nd IUI cycle. The actual IUI was on Thursday March 5th, been on progesterone the last 2 days. I had some mild cramping with it last cycle, but Lastnight into today I am having major cramps... So bad I can hardly stand up. The cramps are causing sharp stabbing pains, and lots of deep pressure. I don't know what it is or what to do. I have never felt this before. Any ideas or advice? Should I call nurse or go to doctor?