My last period was Sept. 7, and all my periods are like clock work, 28 days exactly. This month I had unprotected sex around the time of perdicted ovulation (according to an app I have). Normally I get af in the morning, yesterday I was supposed to get my period but it didn't come. However at about 3 o clock yesterday I went to the bathroom and when I wiped there was a very very small amount of blood (like a drop) it was light red color. Normally before my period I get horrible cramps, but this time I have had little to no cramps at all. I though maybe it was a funny period and would just pick up as the day went. So far (a day later) I have had no more bleeding at all, but every now and then I have very slight cramps. Could the light bleeding that only happened when I wiped be implantation bleeding? Is it possible I ovulate late in my cycle and implantation is to blame? Please help! Thank you all!