Need Feedback!

So short back story. I made a decision which I know was wrong to have sex with a male person I know. We have had a very rocky and testy past six plus years.

I’m seven weeks pregnant and have my first ultrasound on the 29th of April. I won’t be saying anything to him till at least after May. I know he has other kids and made it clear that he wouldn’t want another kid.

I thought is was doing good with my tracking on the app. I got sick for almost a week and was taking meds which didn’t dawn on me at the time.

My question is do I tell him at all? Do I just wait till I can’t hide it anymore? I plan on drawing up a paper that lets him know I do t expect anything from him for the baby and he has no obligations to the baby unless he personally decides he wants too. Honestly I don’t want to tell him at all but I also know it’s a matter of respect for the other person.