hey guys, i am taking blackmores as well and i find the constapation is ALOT worse after i ov. the increasing progesterone in the luteal phase causes me the "jam up" as well.
this happens in pregnancy too. the black i guess is from the excess iron you don't need.
i agree with missya try altaneting between the multi and plain folic acid,
my stratagy (?sp) i take the multi up until about 5dpo then switch to the folic acid. i also always take with food and drink loads of water.
hth