Welcome Kylie - and I am sorry to read of your losses.

Most clinicians will commence you on clexane (heparin) from evidence of a viable pregnancy - meaning an u/s that shows an embryo that measures = to dates. Some will commence clexane from a positive pregnancy test. The reason that some clinicians don't like to commence clexane this early is that ectopic pregnancy has to be ruled out. Obviously with ectopic pregnancy the risk of bleeding is high and the anticoagulant produces an extra risk factor.

I commenced my anticoagulant therapy from a bfp - I had lost 6 babies - 3 in the second trimester and I found that the outcomes where slightly better for women who commenced therapy from confirmation of pregnancy. Having said that it would be very risky if there was an ectopic pregnancy. I was willing to take that risk and so was my clinician - my risk of ectopic was small compared to my risk of pregnancy loss.

I hope this helps and I hope you get your on the 9th of October.