Hi. Well, that's exciting! Trying for baby is fun even when a little frustrating! In looking for your timing, you seem to be guessing it well. My doctor always told me that you start counting on the first day of a cycle (first day of your period) and at day 10, begin having sex every other day for the next 10 days. As you said, since your cycle is a little longer, you'd go for extra days. maybe an extra 10 days to make sure. :>) That is intercourse every other day all that time. This is the best way to catch the egg! Were you successful this last cycle? Maybe. Some women have exactly what you describe. Small trace amounts of blood during implantation. I never had implantation. I get what you have and it means my period is on its way. But time will tell. Spotting for me though is usually more brown.
Have you ever done temperature taking? It really helped me and added in just a bit more data to understand what my body was doing. Let me know if you want to know how to do that!