Contractions

Lately the weather has finally been nice enough to go out and play where I live. I’ve been taking my little boy and dog on walks. When I do I start to feel baby girl pushing down and get a few contractions but stop after about 30 minutes. Is this normal or should I bring it up to my doctor? My BP was a little high my last appt so I have to go see him this Wednesday. Not sure if it’s related to that.