First time with Clomid.

It's been 16days since the start of my last period. I took 50mg clomid for the first time during my last cycle. I did not use an ovulation kit this month but last month I ovulated on day 17. Anyways I woke up this morning with stomach cramps so bad I could barley stand up. It's now a couple hours later and they are still there but very mild. I was just wondering if this is Normal?