Baby Boom?

We host a bible study at our house every Tuesday night. A couple of years ago when we first started going to the group there were no kids. Right now, there are 3 of us that are pregnant within 2 months of each other. Bizarre! Believe it or not, Sarah (in the green) is 4 weeks ahead of me and Shawna (in the black and white) is 8-9 weeks ahead of me. Although, based on the picture it looks like I should be ready to deliver at any minute! So, our group will have 5 new members in a few months! Our upstairs neighbor is also pregnant for the first time. We belong to a marriage group that now has 6 pregnant ladies (and there are only 7-8 couples). That's 7 new babies! We have a couple of friends in our church who are pregnant and we have another friend in the East Bay who is also expecting! That's over 13 babies all due in the next 6 months! So, Eric and I were trying to figure out if there is a baby boom going on or is it just our age? I've never seen this many pregnant women in my life! Any input would be appreciated!