STMs: Pregnancy causing potty training issues?

KatK421

I nanny for my sisters kids, ages 5, 2.5 (almost 3), and 1. My nephew, who will be 3 in December, has had issues with potty training the last 2 weeks. Nothing has changed, really. No schedule changes, no new people, nothing either my sister, BIL or I can figure out. The only thing I can think of is my pregnancy.

I've watched her kids 5 days a week since the oldest was 6 weeks old, so I'm practically a second mom to the kids. When I told the kids that I was going to have a baby, my 5 yr old niece was so excited. I didn't expect my nephew to say anything or care at all, but a couple days later he asked me "Why you have a baby in your belly?" and then "I don't want you to have a baby in your belly." This was about 2 months ago, and he hasn't said a word about it since.

 The last two weeks he's been having issues with potty training out of the blue, and we can't pinpoint why. I feel terribly guilty that the thing stressing him out is me having a baby. It would be nice to blame it on his older sister going back to school, but she was in school full time last year too, and her camp over the summer was 4 days a week. Could it be my pregnancy? Is anyone having this trouble with thier kids?