AF or implantation?

Hi Ladies. AF was supposed to arrive today but as far as I'm concerned she has not. I'm normally bang on time with my periods and I would know she is here by the cramping, would normally go to the loo and there she is in full force and normally heavy. Now last night I had some cramps and thought she was coming so went to the loo and wiped, it was very very pale pink. So of course I was thinking this was her on her way. Now today I've had no cramps, at times thought she was there properly as I felt a bit more 'moist' down there if yous get me but when I've went to loo nothing except light pink again. Now it has completely stopped and still no sign of proper AF as I would know it. Could this be a sign of implantation or do you think AF? Always so scared to take a test as always comes out negative 😕😕