Provera..

I'm taking Provera for 10 days to bring on AF, today is day 8, I have been taking the pills before work every morning at 730, today being the weekend I forgot to take them this morning. I'm beginning to spot and thing AF is coming so I'm just going to not take the last 2 pills. However... the last hour I've been getting horrid cramps.. and they keep getting worse. To the point of me feeling sick to my stomach even.. is this normal for provera?