pregnant runners

Anyone pregnant and still running? I'm a runner and I completed a half right before I got pregnant, but the first trimester nausea set me back so much I was down to 2 miles every other day due to low blood pressure/exhaustion/nausea. Today at 18.5 weeks I got back up to five fast miles!!! I really want to maintain this throughout the rest of my pregnancy. Any advice from former and current preggo runners would be greatly appreciated :)