I previously just had a misscarriage and I was 3 1/2 months along. After the pregnancy, I gained like an extra 5 pounds. However, it seems as though I've gained more because my jeans and everything else does not fit like they once did. I notice my arms, stomach and thighs have all gotten bigger. I'm wondering what's the best way to get back into shape and get my body toned within 2-3 months..? Help me please! (By the way, I am 21, 5'5, 137 ibs)

Eat healthy, cut back on carbs, no fast food and walk or exercise 3 or 4 times a week.

Eat healthy, cut back on carbs, no fast food and walk or excercise 3 or 4 times a week.
I agree. Short answer but right to the point.
Have a look at this post I added a while back. Have a look at it and take what you feel would work for you.
https://www.askmehelpdesk.com/fitness/12-week-fitness-program-works-lose-weight-stay-shape-191276.html
It takes time but you will get back into shape in no time.