Hey there, there are many great things going on for you! Let's first not lose sight of that - you are now a licensed OT and you are starting a family. These are all great things. I understand where you are coming from in that you do not want to spend the first years of your marriage in medical school or in residency, but truth be told, you need to recognize that regardless of your age and life circumstances, your partner ends up "going" to medical school and residency with you anyway. They support you, they see your challenges, and they go through your struggles through the program, but just from a partner standpoint. Enjoying the first few years of marriage is one thing, but make sure you don't deter yourself so early on in the game, because even if you did go to med school let's say 2-3 years earlier, you and your wife would still be juggling residency (+ fellowship). You still have 3-4 decades of working life ahead of you! There simply isn't the best time to one thing to be honest - doing med school in your early 20s is the most convenient, sure - but end of the day, you need to make choices and choices that sit well with you. You will get old anyways, time will fly anyways. As long as your spouse is on board and supportive of your goals - and you both are willing to make it work - I don't think you need to throw in the towel just yet.
We also wish "timing was a little better", but I also think that this moment is all we have, so make the most of it. There is no best time for anything.
That said, there will be financial penalties - like lost income, opportunity cost, and your spouse may need to do some lifting in the interim (+ LOC debt). You and your spouse need to have an honest discussion about this, especially if you plan on having kids during medical school. There are many adjusted medical students who have families with kids. I am constantly so in awe at how able they are to cope with the demands of medical school - but hey, if there is a will, there is a way.
The practical details are important, but just remember that time ticks away regardless, focus on what goals matter to you and your family
Feel free to PM me.