Help! I’m pregnant again!

I’m a ftm to my son who is just 4mo old, his original due date was July 3rd. I just found out I’m pregnant again and the new baby’s due date is estimated July 5th based off my period. I haven’t even told my bf yet (we live together) because I took the test while he was sleeping. I was only 3 days late so I took a test just incase thinking there’s no way it could come out positive. I’m so stressed out.

Just any advice in general? How do I tell my bf?