Almost 28 weeks, do I need to call my dr?

I'm almost 28 weeks pregnant, my first son was born June 10 2016 and I'm due June 7 2017 so pregnancies are close together. Dr told me at 20 week ultrasound My baby is measuring 2 weeks big. Today I've been feeling "off", contractions nothing consistent but with some pain and pressure down below, I've been restless all day, just overall feeling funny. Baby's moving like he normally does and I've been drinking water/ Gatorade all day. Opinions?