PG test 13 days post ovidrel

Help! I had my ovidrel shot on 1/8. Today is 1/21 and I got a positive but I'm not sure if it is too early and too good to be true!! I'm nervous about telling my husband because I don't want him to get excited if it is a false positive due to ovidrel! My fertility doctor said I could test Sunday...
Am I too early? Anyone heard of ovidrel staying in your system more than 12 days?