My two children have an age gap of 14 years between them and both times i was pregnant i had horses. Just used to time my trips to yard with nap time, but i was lucky as they were both good babies and slept in the car, so i could muck out and ride as i could park the car next to school or my sister would watch them.
my youngest is now 4 so he goes to nursery every day for 3 hours which is great.Or his brother babysits!!
I also have a great OH who never complains when i compete every 2 weeks, go for lessons and on horse camps.
Also think where there is a will there is a way.