Exercise & pregnancy?

Kayla • Infertility warrior for 6 years, endometriosis & PCOS fighter, Expecting our first baby boy 6/2021 💙 after 2 miscarriages 4/27/20👼🏼
My husband is finally at the point of wanting to have kids, but I'm at the point of wanting to lose all this excess fat. How do I safely incorporate exercise during [possible] pregnancy to help lose unnecessary weight? Any video suggestions, walking? Am I still able to lift weights?