Is it bad?

My in-laws offered to pay our (my husband and I) way on a cruise for the summer of 2016 as a big family vacation. I'm pregnant and die in November so by the time the cruise rolls around the baby would be 7 months old. Is it terrible and selfish that I want to go?  I'm not even sure I could b/c most moms tell me how hard it is to be away from their babies, but I'm feeling guilty for even wanting to do it.