Implantation bleeding or sign of period?

Shania

I went to pee just about 30 mins ago and when I wiped there was this ONE spot of blood...just one dot. Now mind you I have a one year old and I am not trying to get pregnant. I am on birth control and me and my husband had intercourse on the 28th of April...usually when I wipe and there is blood, there is more then one dot and it shows up every time I wipe, I got my period the next day. This is just one tiny dot and I saw this when I got pregnant with my son...what do you lady’s think? There was nothing on the paper when I wiped and it is right in my CM...HELP!!!!