I was off meds and really stable during pregnancy. It was like the hormonal overdrive that is pregnancy helped me be stable. What got me was weaning from breastfeeding. Both times I did it (I have two boys) I went horribly manic then rode a roller coaster. This second time I haven't been able to get of the rollercoaster even though I've been dine breastfeeding for over a year and a half.