Implantation bleeding?

So me and my other half have been trying to conceive for nearly 2 years now. I am often late on my period which always gives false hope, although this time round I was due on 3 days ago. I thought I had started my period yesterday as when I wiped there was slights a slight pink discharge on the tissue and a tiny bit on my knickers. I also had very mild cramps.  I put on a sanitary towel but hours and hours passed and there was nothing else there, 24 hours later and still no period... Could that have been implantion bleeding?