17 weeks with Braxton hicks.

I am 17 weeks with baby #3 and for a few weeks now I've been feeling what I thought was my uterus stretching, until the last week it's become more uncomfortable, where I actually have to catch my breath,  every hour or so I start to feel a deep pressure and I can feel my uterus go really hard which lasts about 5 seconds, it honesty feels like the beginning of labor felt with my two other children, I know this feeling very well, but I've never experienced contractions this early!