Ok so my last period was April 13 and It lasted four days. I have irregular periods but my period still hasn't started and usually it starts by now. Me and my sister usually start round the same time and she is already done with hers. I get cramps like its gonna start but nothing. I've token pregancy test and all neg and even took two today and nothing. I had sex today and when I went to wipe there was very very faint tint like pinkish reddish . I'm not bleeding at all. Advice please