Dating after divorce

What do you think is an appropriate amount of time to wait? I don’t plan on saying anytime soon seeing that I’m pregnant and not due until December but I’m pretty sure my husband is already seeing someone considering I left because he’s been cheating on me. Just wondering what your opinion is and how did you get back out there. I’ve been with my husband for 7 1/2 years since our junior year of high school so I don’t even know how you find people to date 😬