Pinkish discharge

I’m 6 weeks 4 days pregnant, hcg levels rising well. Today I spent all day at the zoo with my toddler, I went to the bathroom once we got home and noticed I had pinkish discharge in my underwear. When I wiped I couldn’t notice it on the toilet paper. I have mild cramping, and some back pains. I’m going to call my doctor tomorrow but have any of you experienced this and it turn out okay?