Thank you for the advice, i will tell him soon. Yes he is the father of our son and our three loses.
I think it would be best to go ahead and tell him. He obviously stuck around for the other ones (I'm assuming they were his) so this time should be no different. By telling him now, you will have someone there to share your excitement and someone to support you no matter what the outcome. Besides, he's the father, he has a right to know regardless of the outcome.
DH and I were seperated and actually going through the divorce process when i found out i was pregnant in aug 07. I ended up having a natural m/c and didn't tell him until a few months later. His response was to tell me that I should have told him, that he would have supported me and been there for me even though we were having major issues.