I'm 41 and definitely noticed changes too. I used to be soooo regular - like due at 10.04 am on X day but when I came off the pill after DD2 my cycles started getting more hit and miss - one very embarrassing day where I got caught completely offguard in cream trousers at my daughter's kindy!

I used to have pretty light periods that only lasted 3 days or so, with a migraine at the start and the first day of cramping. Pre this pregnancy they were more like 8 days long with a couple of really, really heavy days, migraines throughout the whole thing and cramping for days too. Oh yay!

After this baby is born I am very seriously considering a hysterectomy. Medications frequently exacerbate my migraines so hormone treatment isn't such an option, and full menopause could be a loooong way off yet.