Any mums who exercise?

A 💕
I have never been to a gym in my life, but before I got pregnant I would do home exercises every night. I have a cross trainer which i would use, and I was really self concious about my butt so I would do alot of squats and just simple home exercises like that everyday. I continued that till my 6th week of pregnancy when I got really bad nausea and sickness and physically didnt have the energy to do any exercise at all. My sickness lasted till about 18weeks but by then my belly had started getting bigger and I had no motivation to get back into the routine I was in before. Since then I have not used my cross trainer once, and ive probably done my squats about 5 times. Im 32 weeks so obviously thats a long time. the only problem I have now is my bum. The rest of my body is fine, but from my bum to the back of my thighs is awful, it all sags down, my bum is soooo flat and its covered in cellulite (which i never had before). Would it be safe to start exercising again now, after having such a big break? And has anyone dealt with getting rid of cellulite before, because I dont know what to do avout that. I drink alot of water if that helps?