Breastfeeding while pregnant

I have a 17 month old toddler who I still breast feed quite often (on demand but mostly before naps and bed) I am 6 weeks pregnant now and the only gf of mine who has been through a similar situation ended up stopping when she got pregnant and I'm really hoping this isnt the case.. at least not anytime soon. So I guess I'm just curious to hear other womans experiences with breastfeeding while pregnant. Did your toddler or baby stop because of the changes? Were you successful in nursing throughout pregnancy? My goal was to make it to 2 years and I am due 1 month after my sons 2nd birthday.