When to tell new job I’m 28 weeks pregnant?

Heather

I was laid off back in March at 20 weeks pregnant and managed to get in contact and interview at a company I worked at years ago a couple weeks after. In order to not face discrimination again (I believe my layoff was due to my pregnancy) I hid my belly during the interview. I have since been offered and accepted the job and start next week, but I don’t know how to tell them I’m due so soon. Any help is appreciated!