Stressed! The pressure is too much.

Hi, so I've seen a venue that I like and I'm currently having a June date held for me for 2 weeks. But I'm not 100% sure I'm going to go with it. (My fiancé hasn't yet seen it, he's coming to see it next week) I've got just over a week left and was hoping to go see more venues this weekend with him to be sure but fiancé doesn't seem bothered so we didn't end up viewing anywhere else. What if I have to let that June date go because we can't make up our minds in a week and then regret it later on when we don't find somewhere that matches up? Then June will be fully booked by then, I'm sure! August was already fully booked, couldn't pick then unfortunately. I'm also going to be trying for a baby next year (I want one before I'm 35 and I'm 33 in January) and don't want a big bump for the wedding! So September may be too late. I'm completely lost.