I'm not a doctor etc etc but my experience with my last pregnancy...
My platelets were between 100-120 the last half of my pregnancy. My doctor said that as long as they were above 100 there was no reason to even consider thinking twice about it... They could still do an epi or cs if I needed one. A few days before I was due they dipped to about 60 I was put on steroids for 48 hours to increase my platelets incase they had to do an emergency csection. They said if I wasn't about to give birth they wouldn't do anything unless I was having other symptoms and I was just being treated just in case. When I went into labor a few days later they were at 150+.