Pregnant and haven’t told the dad yet. Should I wait?

I’m 7 weeks pregnant. I found out 3 weeks after my ex and I split up and I didn’t tell him because I was nervous. I’ve known for over 2 weeks now and still have not told him. I kinda think I want to go ahead and tell him and get it over with but should I wait a little bit longer? I had my first ultrasound last week and blood work done, my doctor told me I have low progesterone which can cause a miscarriage is low enough. They put me on progesterone pills and I go back for more blood work this coming week to see if it’s helping at all. The baby was in there and did have a heartbeat and stuff. But should I just wait to tell him until I know if I’m gonna miscarry or not?😅 If I tell him and then lose the baby i just feel like I’d have told him for nothing, but I also feel like if the baby is fine and I don’t end up miscarrying then the longer I wait he’s going to be mad that I didn’t say something sooner… what should I do?