Deborah, I have the same gap twice as you know. It wasn't as hard as I thought it would be - Briona was such a busy and refluxy baby and Kryssi is the most relaxed baby ever! By the time you have #3, Alan will be old enough to climb in/out his car seat and walk some places (not just in the stroller) and dress himself and go fetch... so might even be easier than 2. On the other hand, 2 arms and 3 children can be a bit tricky. If your DH is happy to support you with 3 and you have friends you can call on, go for it! It's no madder than 2
Oh - and don't break your foot, ok?