What is it making me feel this way?!?!

I’ve been having small short cramps/pains here and there by my rib cage on the right side, and by my abdomen and vagina, and also I’ve been having excessive hunger in spurts or my stomach feels upset constantly what is this? I’ve tested and they all come out negative and I just got off my period last Thursday. I’ve been doing sex every other night or every 2 nights as we are trying for a baby right now. Should I see a dr for this or ignore it as my body may be changing in a million different ways (processing food, bowels, etc)