Spotting, cramping, and running

Julia
I am 4 weeks 1 day along (AF due yesterday) and am experiencing light brown discharge and medium intensity cramping. Trying to stay optimistic but am having a hard time not going down the rabbit hole of gloom 😞
Is anyone else an avid runner? I'm staying hydrated and nourished but don't know if I need to cut back my mileage (~35miles/week). My first prenatal appt isn't until April 18, and it feels eons away. 
Please stay in there little one! We already love you!