Running while pregnant

Any mamas out there that run during pregnancy? I have been running pretty much every day for a few months now, and while not super long distances, I am having a very hard time with what I usually do. Like, last night, I warmed up with a 5 minute brisk walk, and was only able to get through 7 minutes of running on a treadmill. I usually run at a 6.5/7 and by the end of the 7 minutes I was waaaaay out of breath and feeling nauseous and dizzy. I even tried slowing down my pace, but ended up just having to walk for the rest of my cardio time. I have never experienced this before, and am just wondering if anyone else has. Is this something that happens normally? Should I push through it? Just looking for some advice on how to get over this and get back to running at my usual pace, or slower but longer distance. Thanks!