Overtraining?

26F Was reasonably in shape but starting lifting heavy about 4 weeks ago. 4 day upper/lower split, 4 or 5exercises to failure or 1-2 RIR. I am pretty sore after every session but I am getting stronger and can do a lot I’ve never been able to do before (farm chores, moving furniture, etc.). I am loving my training plan. However, I had a couple of miserable low energy days with intense soreness and at the same time realized I didn’t get my period. Wondering if this is normal or if I’m pushing too hard.