Short periods- fertility problem?

Hi all, I stopped taking bcp in August after being on them for 4 years. My periods after stopping the pill have been much shorter than I’ve ever had them- I have 2 days of medium heavy flow then by day 3 it’s very light spotting and day 4 it’s almost done. My periods before were always around 5 days and tapered out, no sudden stopping. Has anyone had this problem? Would this likely be an issue with ttc? I also have shortish luteal phase (11-12 days) so that might be a bigger issue, sigh 😞