Just wondering if anyone can shed light on this....

I have never had period pains as such but now having had 2 AF since V was born my vagina is so sore and achey at AF time. Another friend who had a csect feels the same... Any idea what this could be? It feels like a very dull labour pain but brings back the uncomfortable feeling that reminds me how labour feels. It is not high up but in the thick of it so to speak...lol...