Weight gain after pregnancy

Hi mamas I'm curious if anyone else is in this situation or could give insight

When I got pregnant I was about 175lb

I got up to 188lb when I delivered

I lost the weight pretty fast, by 5 weeks pp I was down to 160lb

I started having postpartum anxiety and my doctor put me on lexapro in may. I think I started gaining weight around that point. Now I'm 190lb. I hate my body! I don't understand how I've gained so much wait in such a short time.

I haven't changed anything other then the medication.

Has anyone else experienced this with lexapro? Or is this something that happens after baby ?