Self conscious/ how to lose weight after baby

What can I do to lose weight quick after I have my baby? I feel like I'm huge and getting a double chin, bigger arms, ass isn't as nice as before.. 😕 Do belly bands work? And if so any recommendations? How soon after birth can I work out? I've gained probably 15 pounds and I'm only 26 weeks. 😩 I was 170, went to 149 from hypermesis and at appt 3 weeks ago was 159. I feel disgusting and not like myself anymore.