Running and exercising while pregnant

Rosie • USMC fiancé 🇺🇸❤️ Expecting first baby January 2017!
So I have done numerous Spartan Races, exercise pretty regularly but toned it down when I found out I was pregnant. I ran a half marathon right before getting pregnant so I'm pretty active ... I want to continue running but not sure if it's safe, I'll be asking my OB once I go next week but wanted first hand advise or experiences from any mommie runners ? 
Thanks in advance, gals!