I just started PGY2 year and have a 2 yr old, with another baby on the way. I agree with making sure you have solid childcare plans, whether that be husband, family, nanny, Au pair, or daycare (less ideal). You should try to plan your due date for a rotation that is less busy and if possible, has less call, to decrease the amount of rescheduling needed. Keep in mind, that having a child in residency will likely extend you training a bit (maternity leave, potential complications, etc), but most programs are fine with this. Also keep in mind that it often takes several months to become pregnant (my first took 3 months of trying, second took 5 months). The biggest thing is just to plan for the unexpected with every pregnancy. Make sure you have a back up plan if something unexpected comes up with the pregnancy/delivery/child care. If you have any specific questions, feel free to pm me.