Just to reassure you - I wasn't very good at doing mine during my first pregnancy and I had no problems with incontinence afterwards (and I had a big baby with a forceps birth). For about a month after the birth I did find that when I had to go I had to go pretty quickly, I couldn't hang on for too long but this resolved itself fairly quickly. I tried to remember to do them while I was breastfeeding. When I had my 6 week check with my OB he checked them and was pleased I could isolate the muscle perfectly, just told me to keep up with the exercises.

Just start doing them now, it's not too late by a long shot! I'm 36 weeks into my second pregnancy now and I try to do mine in bed at night before I go to sleep. I try and hold on for 10 seconds then release for 5 seconds and do that 10 times, then do 10 quick repetitions. I do this whole set 3 to 5 times, depending on how tired I am. I am finding with this pregnancy I am running to the loo a lot and I don't remember it being quite like this with DS so it's a great habit to get into. Really should be like brushing your teeth, something that you don't even think about. Not to mention it's better for you when you DTD.