Feeling Stretch Marks forming?

Elizabeth
So last week I saw a few stretch marks forming in the lower part of my tummy & I freaked out! I'm currently 36 weeks and I'm not sure if it's bc I can't stop thinking of them or if it's really happening but my whole lower part of my belly feels irritated, itchy and I feel as if my skin was stretching. Can it be that I am feeling the stretch marks forming or am I just losing my marbles?