Ay, that's unusual talaga, normally pag nag-start ka ng pills, dapat consistent ka para ma-regulate ang cycle mo, kaya baka ang sudden stop ay nag-trigger ng bleeding, sis. A few of us moms experienced breakthrough bleeding or early period din pag nag-miss kami or nag-stop ng pills suddenly, pero everyone's body is different, so honestly better check with your OB para ma-confirm kung bakit nangyari yan sa'yo at kung normal lang or may something else going on. Seryoso lang, hindi worth guessing pag dating sa hormones, especially pag concerned ka.