Re: Aikido and pregnancy
I quit practicing while pregnant. I was nikkyu at the time and fairly competent at protecting myself, but it just didn't "feel" right to practice (neither did jogging). Went back when my son was a few months old with no problems other than childcare.
I just chatted with a woman who has two kids and she practiced with both up until the 6th month or so, no breakfalls. Each person has to judge for herself how it feels and whether there are issues with rolling.