Before you enter the queue, make sure you both know where the exit is and have a meeting spot. You can ask the Cast Member at the entrance for help. The reason for this is that you will only have to wait for the length of the actual ride which won't be long so there won't be a lot of time for you to do things on your own. So you should stay at the exit or a nearby place and your husband will be joining you in about ten minutes. Since you are pregnant, you might also want to scope out where the nearby bathrooms are (says the woman who visited every single bathroom at Disney World while pregnant
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Your husband can also take the opportunity to give you anything he doesn't want to take on the ride. Such as his hat if he wears one. Or a backpack if he's carrying one.
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These are some good points, but there are exceptions to the meeting up in ten minutes.
While we sort of use meeting spots, we improve the experience dramatically with cell phones.
In the case of say - ToT- if you use the chicken exit, then you are correct. The length of the ride is all you'd wait in most cases, which would be short. I was more thinking about splitting up - like Single Rider or if they each use their FP for different attractions- then they would be apart longer.
Once in a great while rides get stuck. Funny story of sorts: Some years ago, part of our family went on Splash- (just) before we (all) had cell phones. Everyone not riding was stuck in the designated meeting spot for almost two hours! This was under old FP system. The two family members that got stuck on Splash got an extra set of FP! Everyone else did NOT! Though getting stuck listening to the singing turtles for two hours was pretty miserable! Still, it kind of ruined much of everyone's afternoon.
Over the years we've been stuck on rides a number of times. Just in the last year, we got stuck on Harry Potter for almost an hour due to an idiot bringing something on the ride he should not have had.
I also think the idea of the OP knowing bathroom locations is also handy. We've been to WDW so many times, I think I know them all! There is often one close to major rides.
Universal is quite strict about bringing bags and items on rides. If the OP happens to go there, then having her hold stuff while he rides would be very useful! Otherwise you have to put ALL your stuff in a locker while you ride. The lockers are free, but it still takes time. On a few rides, guests can't even bring phones or anything.