Confused!

S

My period was supposed to start yesterday but it didn't, which isn't the confusing thing because they can be a little off by a couple days either way for me.

Yesterday afternoon when I wiped it was ever so slightly tinged pink. so I thought my period would be starting soon but still nothing.

could this be implantation bleeding? I did take a test with fmu yesterday and it was negative. so that adds to the confusion.