Ah sis, marami akong kaibigan na ganyan after CS, lalo na kung breastfeeding ka pa, ang pills sometimes don't work agad or hindi effective while nursing kaya pwedeng delayed ang period mo or hindi pa bumalik ng maayos. Better to check with your OB about this kasi 1.5 years na at dapat na regular na dapat, baka kailangan i-adjust yung contraceptive mo or may iba pang rason, mas safe kung sinigurado mo with your doctor para may peace of mind ka!