Hi there. I'm not in your DDC, but with your fertility treatments did you have several eggs? It could be fluid from all of the follicles. I also had fertility treatments and I was so sore after I ovulated because of all of the extra fluid from the follicles. I wasn't bad enough to warrant being hospitalized, but I was advised bed rest and lots of liquids.
I would suggest calling your doctor though.
Deadra, Wife to Adam , Mama to Beatrix (02/08), Hudson (01/10), and Mazarine (12/13)