sisters wedding and TTC

So my sister is getting married October 7th 2017 and my other friend the next weekend on the 14th! I am the MOH in my sisters wedding and a bridesmaid in my others friend. This is my ONLY sister and only sibiling. We have been TTC for 3 cycles now. AF is due 1/10. If it does come, we are thinking of putting off TTC for one month! Because if we happened to get pregnant next cycle, the due date would roughly be October 17th. I don't want the due date too close to my sisters wedding. Her wedding is not here where I live at so I have to do a little traveling to get there. Basically, we are back and fourth with putting it off for a month or two to make sure our due date wouldn't be too close because I don't want to miss my only sisters wedding! Hopefully this is the only time she will get married haha. So basically, what do y'all think of putting it off for a month or two? We don't care about being pregnant at the wedding! Just don't want to miss it because of the due date being right at it. Also we were think of not trying but not preventing. But then again idk 😩