Hi sweetmac....Are you trying to conceive? Did you use protection?
Some women who are pregnant will bleed every month when their period is due which can be confusing, but sometimes these things just happen. I would suggest doing a pregnancy test as it would be 3 weeks since you conceived, but you would be 5 weeks pregnant .... If you are pregnant that is.
Fingers crossed and I hope you get the answer you want.
Xx