Need help.

Samantha
I got my BFP WHICH IS GREAT news but I feel like I can't get excited and I don't think I want to either. 
I'm so scared after the last positive ended in a misscarriage feel like it could happen again 
Even my fiancé is refusing to accept the tests are positive and says we will
Wait few weeks before informing our dr 
I don't know what to do? Has anybody else felt this way?