Okay so I had my nexplanon arm inplant bc removed on December 7th. Got my first period on December 13th lasted 6 days. Well about a week ago I had some spotting but didn't think anything of it, two days ago I had ovulation cramps which was right on time for my ovulation time. Then yesterday I had very sensitive smell, cramps, headaches, and crabbiness. So I took a first response test right when I woke up to be safe. And there is a very faint positive but even my S/O sees the two lines. How could I get a positive test if i just ovulated 2 days ago?

Please let me know your opinions