pregnancy and weddings

So after begging and pleading with my husband for months and months, he FINALLY agreed to trying for our third baby. We have 2 girls and he REALLY wants a son. So as you can guess, I'm SUPER excited and happier than ever that we are finally going to try. However, yesterday my mom reminded me that if I get pregnant soon, I will be due around my sisters wedding date. I spoke to my sister briefly about it and her concern is not about me being a whale (lol) but that I won't be there because I may go into labor. Now in my experience with my other 2, after like 35 weeks, my body calls it quits and I've been induced with both of my girls 3 and 4 weeks early. I'm assuming it would probably be the same thing this time around. Am I being selfish by wanting to keep trying anyway even though my due date may be in the same month as my sisters wedding?