Cramping 10 days after hsg test??

Angel
I had my hsg test on cd5, the day after af ended. It's now cd15 and Ive been having mild af like cramps for the past 4 days. Is this normal? I ovulated on cd18 last month and usually have a 28-29 day cycle. All my opks are still negative and very faint, and I usually dont cramp until the day before af is due. I've been ttc for over 5 years.