After DS1 I had a bleed around 6 weeks, a couple of weeks after any other bleeding, and the dr thought it might be my period. I didn't get another one for over a year though. Maybe you will be the same?
Enjoy mother's group. I might have to join one this time round, my mum's exercise group is all over now as the PT who ran it is moving away. I am very sad. No more social exercise classes... I may never get that 6 pack back after all.