Implantation bleeding or period?

Rebekah

Hello!

My Wife and I are currently TTC. We used a donor through shipping, at about 4dpo she began to have symptoms that usually didn’t run with her period time line. Today she is 10dpo and experienced a couple of sharp like cramps and a streak of pink blood. Could this be implantation or her period? Her period is supposed to start Wednesday and she almost always never spots beforehand. Help!