Should I get checked out?

Hi, im 22[F] 5'3, white, and suddenly 168 lbs, I have been having issues with being constantly tired, like exhausted and just sleep, I also get extremely hot. My house is kept at 65⁰ F but I'll be sweating and be so hot I need to lay directly under a fan nude. I have also suddenly gained around 20 lbs, should I get a thyroid test or am I just getting fat? Medicine being taken : Steraline 100mg Mili birth control