1st Trimester Bleeding

According to Glow, I'm about 4 weeks 6 days. Everything's been fine thus far, no sickness, no nothing, until today. Today I went to pee, wiped and saw pink. I'm scared because I've read so many stories about women having miscarriages around this time. This will be my second pregnancy and second child. I go to the dr for a first time visit Monday. Thoughts?