I was wearing maternity clothes by the time I was 12 weeks with my 2nd. I just busted out the maternity clothes with this one and I'm 20 weeks today. I always thought that you spread out with boys and carried them all over and low, and with girls it was that you carried high. The problem is that all the web sites I read now say the opposite, so I have no idea! I know that the old wives tale for heart rates is fast for girl (145 & up) and slow for boys (120 to 140ish). How old are your boys?