Progesterone cream? Spot 5 days before af due? Never happens to me!

29 Day cycle and I guess ovulated 14 days before period is due Friday. Super regular and never spot. I had light spotting Tuesday. Should I start using progesterkne cream if I can get it. I'm worried the spotting is due to low progesterone. I feel like I'm getting pregnant because my boobs are big and sore, no acne, tired, anxious, hungry..