do labor contractions feel more like gas/period cramps?

Mia • due February 22 ; Madison Skye ❤
I'm 38 and a half weeks and since yesterday my contractions have been feeling more intense. Before they were very mild and just uncomfortable only in my lower abdomen. Now it feels like gas or period like cramps along my lower back and all over my stomach. I'm just wondering why they feel so different. Anyone experience this?