weird periods

Hi all, we've been TTC since Jan 2017. I've always been quite regular but for the last couple of cycles my period has been a bit late, normally my cycle is 28-29d, and now 31-32d. In addition since Jan my period has become much lighter and shorter in length, it has gone from normal 5days to 1-2days. Also I've started to get unusual spotting during the luteal phase. Spotting lasts from 1-2 weeks at its worst before I get my period. I just recently turned 30, so I was wondering what sort of changes do you other women experience as you get older in terms of your cycles and periods and have you found that it has anything to do with fertility?