First of all, you don't need to be in any rush to get pregnant. You're both still very young. As far as getting pregnant goes, it all depends on how long things take. It generally takes 2-3 days for the sperm to travel up the fallopian tube to fertilize the egg. The fertilized egg takes 2-3 days to travel down the fallopian tube into the uterus. Then, it can take a could of days for the egg to implant. If you are too close to your period your uterine lining will still shed, even if the egg implants. If I were you, I would go ahead and wait until after you get married to worry about getting pregnant. Planning a wedding is stressful, you don't need the added stress of trying to get pregnant. You also want to be able to fully enjoy your honeymoon. (Trust me! I was 7 months pregnant when I got married. A honeymoon would have been our last chance for a vacation without kids. But, we weren't able to take one. It may not seem important to you now, but you'll look back and wish you'd had the chance.) Then you can deal with trying to get pregnant.