Advice please! Bleeding at 4w2d

Alicia
Got my BFP 3 days ago. According to Glow, AF was due 2 days ago, which I didn't get. This morning had light brown blood, which escalated to a heavier bright red blood as the day went on. A minor pain here and there, but No True Cramping. Don't feel the need to go to the ER, but am going to do a walk-in at my doctor tomorrow since they told me they didn't have appointments available. Has this happened to anyone? Any advice? I had 1 miscarriage years ago with severe cramping, but no cramps this time. Very nervous though.