Hi sis! Ang combination ng late period, abdominal pain, white discharge, back pain, fatigue, at mabilis na heartbeat ay talagang kailangan i-check ng doctor kasi may maraming possibilities, buntis man o something else na kailangan tingnan, so please get a pregnancy test or visit your OB agad para ma-rule out ang risks at malaman kung ano talaga ang nangyayari sa iyo. I know ang antala ay nakaka-stress lalo na kung may important plans ka, pero it's really better to know for sure kaya huwag nang mag-alala nang mag-isa at mag-consult na sis! Praying for you, keep us posted okay?