I have taken care of several patients with what is called ITP of pregnancy. The ITP stands for Idiopathic Thrombocytopenic Purpura. A fancy way of saying low platelets of unknown cause. My son had an acute episode at 16 months with a drop down to 32. He was treated with Rhogam actually. If you google it, I know there is a lot of info out there, I would try ITP of pregnancy on your search though, since you haven't had this before pg. Also, if your platelets get really low, you will know b/c you'll have terrible bruising just from normal activities. But one of the women I've cared for in the hospital did bleed a lot more than normal after birth, and then passed out on me in the bathroom. Women with ITP usually have heavier periods. But, remember that your platelet count is still pretty good compared to what is typical in ITP. It definiely is worth following closely, but in the 140's, you would be fine during and after birth. Anything over 100 most of the docs I work with are not too concerned. Hope that helps a bit. Keep us updated!