My last period was 3rd dec i made love to my ex on 8th ovulated 13-16, made love to my lover on 14th, implatation bleeding since 17th, who is the dad?

Implantation : Bleeding usually doesn't occur ; when it does - it is a drop (s) of blood. The bleeding that occurred may not be implantation bleeding. You may not be pregnant. Encourage you to take a pregnancy test if you miss your period. I would most strongly encourage you to use protection every time you have vaginal intercourse if you are not ready for pregnancy.