Need advice

So I'm kinda nervous and stressed. I've been showing signs of being pregnant but I'm waiting until my missed period to take a test. If I do end up being pregnant I don't know if I should I tell the father because it was a one night stand and I personally don't want to be romantically with the father but I know if I tell him he's going to want to get together to help support the baby. Should I tell him if I am or just leave it??

Update:

I'm planning on testing tonight. I'm waiting for a friend to text me back so she can be with me when I test. I can't deal with the stress of not knowing and I'm not even sure if it'll show since I'll only be about 2 weeks pregnant