help! period or no?

Ok here's a little background...i came off the pill in August and had a 35 day cycle. We are ttc for #1. I'm on day 36 now and went to the bathroom. I saw one very tiny spot of blood in the toilet but wiped and there was nothing besides creamy cm... super weird. i have gone back to the bathroom and still nothing. I have had cramps and a headache...obvious period signs but I'm really hoping there's still a chance for me. What do you guys think? Am I out this month?