I had a normal period in July but at the end of August I only spotted and it was really dark kind of like a coke color.. but when my boyfriend and I would finish having intercourse it was bright red and was very light. This lasted for about 3 days and I have not had a period for September. What could this mean?

If you are normally quite regular, it could mean a possible pregnancy. Maybe your periods are just off, but it would be a good idea to try a pregnancy test to know for sure.