They usually the say the say implantation occurs. And I don't think its possible to get a 1 week level on ovulation day. The sperm is just meeting the egg.. So technically nothing has even happened yet.. Usually about 2 weeks after you ovulate.. Is when detectable levels appear.
Wao that's really shocking
Right away. Mine showed up the day I ovulated. My count was in the 100's (1 week pregnant) I was quite shocked myself.