Ay sis, that's really frustrating, delayed period after switching contraceptives is actually quite common kaya don't worry, maraming moms experience this! Since you've been on pills for a month na and still no period, best to check in with your OB para ma-rule out if may iba pang reason or if kailangan lang talaga ng more time para mag-regulate ang body mo, especially after the injectable, every woman's cycle is different at ang contraceptive transition natin ay medyo makaapekto talaga. You're doing the responsible thing by monitoring and being proactive about it, so you're doing great, mama! Fingers crossed na regular na soon, kaya mo yan.