Not really, sometimes I would have too many alien kids from abductions of scientists, but that has been awhile and you have the option to send them back which I did a few times if they already had some or didn't want them to have a kid. Otherwise I know when my sims are trying for babies and I'm okay with the outcome. If one household has to many for me to manage they get shipped off to a "boarding school". Usually a place I set up with a grandmother figure to bring them up with lots of kid stuff so I can swing around and play them now and then.
I don't usually play with mods so the only real chance is twins or triplets or abduction.
