Fatigue at 21 weeks

Hello

Anyone experience an onset of fatigue around 21 weeks? Feeling so tired lately. Like even going for a walk feel tired. I felt this way as well upto 12 weeks then felt a good amount of energy after that. Now at 21.5 weeks super tired even upon waking up and everything feels so tiring. Any advice? Anyone did anything that helped. I considered maybe I became anemic but not sure. When I did the first trimester checkup I was not. Possible I developed it now but don’t see the doctor until another two weeks or so.