Hi there. My husband and I have been trying to fall pregnant for 3 months now I am 23 and hoped it would happen same time. My periods have never been on time but since having unprotected sex it is always on time. But this month has been different. After intercourse I experienced light pink spotting which went away after a few hours and wad followed by dark brown spotting the next day. Today is the third day and I am spotting light brown and my periods is due in 3 days time. I don't under know whag is happening please help.