Hello, my periods have been every 3 weeks since January and have been regular. My last period came after 2 1/2 weeks. 2 weeks after my 2 1/2 week period my left nipple become very sensitive and that isn t usual for me, usually I get a sensation in my right breast. I thought this period was also going to be after 2 2/12 weeks as I had some pink discharge-nothing came of this. I was due (if I go by my 3 weeks) my period yesterday but as yet nothing more than white/red blood discharge but only when I wipe, nothing on my sanitary towel. I have had on/off cramps which I presumed is my period coming. The discharge is now on it s 2nd day. I did have unprotected sex between the last 3 week period and the 2 1/2 week period but as I got my period I guessed I wasn t pregnant (not saying I am now). It does and has for past couple of days felt like my period is coming now but there has been nothing other than on the toilet paper. Thank you.