Leaving 4 month old baby for 2 nights. Opinions?

Amy
My fiancé and I are getting married in August and we were planning on doing a combined bacclorette and bachelor party by renting a cabin in Tahoe. This will be our first time away from our baby and my fiancé is starting to get second thoughts thinking we shouldn't leave our baby for too long because she's too young. I'll feel bad for leaving her for 3 days but we haven't been out once and I feel like when she's 4 month in July it's a good time for her to start getting used to being baby sat by her grandparents. 
Do you think she's too young to be left for three days while we go on the trip?
We are already postponing our honeymoon to a year later because we don't want to leave our baby for a whole week!