Platelets dropping

Anyone else having their blood platelets drop?  My doctor said they like to see them around 150.  Mine was at 123 at 10 weeks and then 107 at 16 weeks.  Apparently if the level goes below 100 they may have to transfuse my blood to add more platelets and if it gets too low an anesthesiologist will not give me meds for labor.  Now I get to take a blood test at virtually every appointment to keep an eye on my problem.  Yikes!!