Constipation in third trimester

Im 31 weeks pregnant at constipated po ako for almost 3 days na..nuong una may kasamang dugo na po dahil sa sobrang tigas..ang prenatal vitamins ko po is hematinic and calcium..nag.try na po sa more fibre at more water intake na rin pero ngayong araw hindi pa ako nagbabawas..normal po ba?and any suggestion po for constipation. Thank you po#pleasehelp