Please doctors my elder sister is having her fourth baby she is 5 months now and bp sometimes reads 110/70 sometimes 85/60 sometimes it's low like she said and sometimes is normal and she is not a bp patient unlike me that has high bp. Please doctors is it normal for bp to be low during pregnancy and normal sometimes she also doctor told her she can't give medication she should just take rest and take lots of water she said she feel tiredness and headaches sometimes please I need your advice doctors please is there any other life changes she should make thanks in advance God bless