Preseed Success?

J
We used pre seed in December and were pregnant the first round (after 4 months of not using it and not getting pregnant) we were absolutely ecstatic although it was very short lived- 2 1/2 weeks later I had a natural miscarriage. 
I have seen many stories were people have miscarried while using pre seed but I have also seen many success stories using it. 
I just started my first period yesterday and have anxiety about whether we should use it again this cycle. Any one get pregnant with pre seed?