Extremely nervous

Jill • Married to an amazing man. Have a beautiful handsome baby boy. Baby #2 is on the way.
I had a miscarriage last year in October and had a chemical end of February this year. 
I am now once again pregnant but absolutely terrified that it won't last and my rainbow baby will be taken from me again. 
Took my pregnancy tests early. AF wasn't due till this Sunday. But all is positive. Need to get bloodwork done and check progesterone levels and everything else possible. 
Also I haven't told my husband yet because I don't want to have to tell him about another loss if it happens.