Big honeymoon before the wedding?

Hi all! New here and so excited to be here! 💞 My fiance and I just got engaged and picked a date for June 10, we found vendors but haven't officially signed contracts or payed deposits yet. For the past year we've talked about getting married in the spring and then taking off to Europe for a backpacking trip. My family has a reunion planned in Holland for August, so would end off the trip by meeting them there.


Now, my MOH just told me she's had multple positive pregnancy tests and will be due right around the wedding, so likely won't be able to attend. I don't want to move the wedding up so she can come while pregnant, because that's not enough time to plan the wedding we want, plus we want an outdoor wedding. She suggested we get married end of August and just do this big trip as a "pre-honeymoon" BEFORE we get married. We're moving across the country for my fiance's schooling in September, so moving the honeymoon til after isn't really an option.
Has anyone done this big of a pre-honeymoon before? I'm nervous that being gone for 2 months leading up to the big day will be stressful as we won't be around to plan last minute things, and that when we get home we'll have to jump right back into wedding planning and only have a couple weeks until the big day. Or should we just keep our original June date and accept my MOH won't be able to attend?