Cramping and pelvic pressure baby #3

Sarah • Mother of a 6yr old boy and a 3yr old girl and a baby girl on the way

So I've been cramping a lot and having the pressure that you'd normally get after 30 weeks. My doctor said today it's because it's my third and the abdominal muscles are weaker. Anyone else ever experience this? I'll be 15 weeks on the 26th. My doctor also recommended I wear a belly band even tho I'm not getting big yet.