Pink spotting

Brittany • Momma to a babygirl 6.4.19👶🏼💕

So I’m 29 weeks and 4 days. I wear panty liners just because the amount of discharge anyways last night I woke up and had a really small amount of pink spotting on the liner and was just wondering if this has happened to anyone else and why also looking for advice. Hasn’t happened anymore since last night. I’m Going to call ob when they open.