Ay, kasama mo ako dito, delayed period after depo is super common, lalo na kung recently ka lang bumigay ng injection! A few of my mum friends nag-share din na mahaba ang waiting period nila, sometimes 3-4 months pa bago bumalik ang regular cycle kasi talaga ang depo, it takes time mag-settle ang hormones. Since negative ka nang PT pero concerned ka pa rin, I'd really suggest checking with your OB just to be sure and maybe get their peace of mind too, lalo na kung worried ka. In the meantime, keep tracking kasi helpful talaga yan para makita ng doctor ang pattern mo, sending you virtual taps, sis!