I just started this app not too long ago so I haven't had much time for <a href="https://play.google.com/store/apps/details?id=com.glow.android">tracking ovulation</a>. My last period was 11/23/17, I've taken several HPT and all have BFN. My husband and I BD on the 10th and today I woke up to cramping and very light spotting.. could it be implantation bleeding or something else? I've never been so late on AF before and my doc tells me to wait a week and test again.