So confused . My last cycle was 37 days long . This cycle I came on day 37-38 again. That was on Friday and I have only had spotting and brown blood. Mostly nothing. I never have this. I am guessing cannot be implantation as I I ovulated on 28th- august possibly few days later as was positive but looking at it needed to be nuts that but darker . I had unprotected sex late at night on 31st. Negative pregnancy tests. Anyone know ? I think I ahce to go dr for blood test unless start of my Menopause as I am 45 in November . I have 5 children so I know I am blessed x