moms of Twins.. question

TMarie
So I got my BFP today..
And ....Twins run in my family. Last Wedn I had the implantation bleeding. Light and only in the morning. Had some cramping. Thursday nothing. Friday morning SAME THING.. Wiped with the pink blood. Cramping. I'm wondering if there's a possibility!
 For those women who had twins (or are pregnant w twins).. what were your symptoms of twins? :)