5k at 30 weeks?

First time mom. I'm 12 weeks and just signed up for a 5k. It was only after I signed up that I realized I will be 30 weeks on that date (I was thinking it was at more like 25 weeks). Is that too ambitious? I'm a runner and 5k is usually nbd, but I've barely run at all this first trimester due to lethargy/morning sickness. I'm confident that all things being equal, I can get my stamina up, but I don't know what it's like to try to run with a 30-week size belly! Any advice?