Less endurance 7 weeks after miscarriage?

Dawn • After 2 MMCs and 2 CPs in 2016, our 🌈👶🏼 is due 10.17.17.
Any gals on here big fitness buffs? I was very active during my entire pregnancy. After my D&C at 10w 4d, I only walked until my 2 week clearance. Ever since then I can't seem to do my full workouts. My endurance is terrible! Anyone else having this experience or had it in the past? Thanks.