Honestly I agree with everyone else. The newborn days were easy for me, but I had like the magical unicorn of newborn babies, it's normally not like that.
There are a lot of other things about having a newborn that would make planning a wedding and getting married very difficult and uncomfortable though, even if you have the most mild mannered and best sleeping newborn in the world. You're hormonal, bleeding huge clots everywhere, in pain, and if you're nursing then your boobs will leak EVERYWHERE all the time because they overproduce for the first few weeks to the first couple months. You also feel incredibly unattractive and fat because you still have a bit of a bump leftover from your baby (and it takes a while to fit back into your old clothes again). Most of the planning for the wedding would be within the month before as well, so instead of being over the moon with baby bliss and being excited about getting married you will be really stressed out and both experiences will not be enjoyable.
I know that waiting is hard, but I would wait until you were going to be at least still pregnant (preferably second trimester) rather than have a baby right before your wedding or being so pregnant that you're about to pop. Besides, if it were a one off shot for this cycle and you didn't get pregnant, how would you feel? Believe me, you wouldn't feel okay about it, you wouldn't feel like it was fair or meant to be. You'd just be upset that AF showed up or you got a
and that the one off cycle was a bust. You wouldn't be able to just go back to WTT, you'd be begging your DF to try again. And what if you did get pregnant? Sure, at first you'd feel excited about it think "OMG, yay! My eggo is finally preggo!" but after the initial
high wears off and you basically just get to the point of your pregnancy where you're over being pregnant and you're just ready for your baby to get here already (we like to call this pregnancy limbo) you may feel regret that you didn't wait.
Believe me, I really considered asking my DF if we could try just for June and July for a one off chance since it would still be a couple of months or so before our wedding. I know that rationally though I would regret it for all of the reasons I just mentioned to you. I know that it's not the right time and next year will be here before I know it. Besides, there is absolutely no way that he'd say yes.