Period or Implantation

Boyfriend put me on through sex, it was light pink throughout the cycle.

1st day- was a drop of light pink blood then in the evening it got to a light flow

2nd day- it was still a light flow but still light pink blood

3rd day- still light pink but stopped slowly throughout the day.

4th day- it was a drop of pink blood on and off

What can it be?

But no cramps what so ever and normally my boobs hurt throughout my period and there didn’t that’s what’s making me think it’s not my period?