It is possible! It was terrifying for me, not only throughout the pregnancy, but also for 2 months after, because I was so scared I was going to throw a clot. When I got pregnant, my platelets were anywhere between 650-700. As I progressed in the pregnancy, my platelets continued to trend down to the high end of normal which was definitely a relief. I am now two years after delivery and still have platelets in the high end of normal! I definitely expected them to spike after delivery, as did my hematologist, but we are both very happy that they have stayed lower than what they were prior to pregnancy