Positive after provera?!

So I'm very nervous! We have been ttc for 8 months. I was diagnosed with pcos and put on provera to start clomid. Hpt 10 days ago before starting provera was negative. With no period 5 days after finishing provera I decided to test again and it was positive! I'm nervous because I'm not sure how it happened! Has anyone gotten pregnant on provera similarly?