should i try and lose weight even though I'm pregnant?

Donna • 27 year old single mama to the sweetest 2 year old princess! Philadelphia nurse to be💜

I'm around 220 lbs and im 5"4. I used to average at 145 but got sober almost 2 years ago as well as quit cigarettes. mix that with my antidepressant and i gained alot of weight!! fast! i got stretch marks all over me(luckily they have already faded alot). I've downloaded a pregnancy work out that's pretty mild and i walk on rest days. I've been trying to eat better but do you think I need to buckle down and diet harder? I don't want to gain too much eight with this pregnancy and become really unhealthy(especially for my previous small frame). im 10 + 1 weeks! any advice ladies?