Hello Thank you for your query. Firstly, clexane is a blood thinner injection - same as Exhep, that is given to increase blood flow to the developing embryo. These are routinely prescribed after IVF if the patient conceives. however, please discuss with your Doctor regarding the dosage, because these injections can worsen your ITP. HCG is given for pregnancy support in early pregnancy. Regarding your concern about the fetal heart rate - here are some statistics : Between 5 to 9 weeks of gestation there is a rapid increase in the mean heart rate. Normal embryos start at under 85 beats per minute heart rate and it then increases from 110 to 175 beats per minutes (bpm) and stabilizes around 120-160 beats per minute. The lower the fetal heart rate is around 6-8 weeks the higher the miscarriage rate can be predicted.A fetal heart rate below 70 beats per minute around 6-8 weeks usually predicts a miscarriage. A fetal heart rate below 90 beats per minutes is associated with a 86% miscarriage rate, and a fetal heart rate below 120 bpm is associated with a approximately 50% miscarriage rate. take care.