Strained muscle? Or hormones?

I know you all are most likely not a doctor, but would me packing my 40-ish pound toddler around and walking around the block (I’m not used to walking at all) and picking him up and sitting him back down several times cause pain in my ribs under my breasts and lightning type pain inside my breasts?

My upper abdomen hurts too. Idk if it’s from that or if I should see a doctor over it. I think it may be hormonal as I’m due to ovulate. Sorry for asking, my my doctor gave me a new medication and side effect is anxiety, so, I’m worried about it. I also don’t want to go to the doctor and be out of money if it’s nothing serious.