Honestly, it's possible pero very rare talaga, the Depo is super effective kung on-time ka talaga sa injections, kaya kung may positive PT ka, best to confirm agad with your OB para ma-rule out yung possibility at ma-check din kung okay lang ang injection schedule mo or if may timing issue. A few of us moms actually had friends na nag-panic din dito, pero most of the time it was either false positive or timing issue lang, so don't stress too much yet and just get it checked properly!