mayfield...I wish you the best and hope you are happy with whatever you decide. You understand that by posting such a question you open yourself up to all kinds of judgement and opinion, but you seemed to have taken it pretty well without becoming too defensive. Good luck to you and I pray that you'll make the right decision.
As far as maryt goes, I'd like to say that she has answered this question more than once over the years, and has been very consistent with her advice despite being attacked ferociously at times. I myself have no advice to offer, but I must say I appreciate that she stands up for her convictions and doesn't waiver. Happy running!

I am late to the party I guess. Congratulations on  both the BQ and the pregnancy!

This is really an individual thing. If you are fit enough and your body handles pregnancy ok, it may be fine. But it is a risk, probably especially early on. When I got pregnant with my daughter, I was a sub-3 hour marathoner. I ran throughout the pregnancy. I also skiied, hiked and even ice climbed once or twice. I kept my mileage moderate though, 6-7 miles or lower. I gained about 20 lbs.

I would not have considered a marathon during pregnancy. I admired those who did it; I just wasn't comfortable enough with the risk.

You will come back after pregnancy faster than you think. I started running just a couple of weeks after, ran a PR half marathon three months after and ran a 3:03 Boston the folowing year, 9 months out.

Good luck whatever you decide. Don't worry that your running is done, though.