ADVICE PLEASE!!!

Hello everyone, to start off i am 13+1 today and went on a 3.2 mile walk this morning, mind you i havent been active at all really due to just be scared.. towards the end of the walk exhaustion set in pretty bad to the point to where i actually started crying because my legs and hips were hurting, i was do tired and being hungry lol. Now about 4hrs later after naping im still having small cramps in my sides, sometimes just one side. I was just wanting to know if thats normal?