I'm 27 Weeks Pregnant. My Baby's Been Kicking A Lot,

I'm 27 weeks pregnant. My baby's been kicking a lot, but I'm afraid I strained myself a little too much doing some yard work. This is my second pregnancy and I've been feeling what I'm guessing is Braxton-Hicks. It's not regular, and is mild but still noticeable. With my first pregnancy I didn't feel any of these pains, so this is all new to me! My next ob appointment is April 22 and I'm having a second ultrasound on the 18th. I'm 34 years old, aand I know I'm at higher risk, I just wanna know for sure if it's normal the mild pain I'm feeling