I Had A Vacuum Assisted Abortion (due To Complications From

I had a vacuum assisted abortion (due to complications from chickenpox during pregnancy) at 12wks. Nine weeks later and I had no period. Due to the fact that I want to be pregnant asap I went back to my doctor. He gave me norethisterone 10mg daily for five days and said my period would come 3 days after my last pill and that I was to begin clomid on the 2nd through 6th day of my period. however its day 4 after last N pill and no period. had cramping on day 2 and since have a bit of heaviness to my pelvic region. is this normal I am very worried