Mare's milk

["spencer" <spencer@inu.net>]

I would like to know if a mare can have 'milk' in her udder and not be in
foal.  Happened to notice the mares were in nice condition and we have been
riding regularly to try to condition to start competing.  But....milk can
be expressed from their tits.  They don't look in foal.  They "show" around
the stallion across the fence so I didn't consider they would be in foal. 
BUT one day last Jul, the stallion got out when they "all" broke down the
fence.  They would be 9 months along.  Wouldn't they have their bags
filling and look big in the belly.  Both have had foals.  Hate to have to
loose another year of riding competitively, but don't want to get them
palpated unnecessarily.  Any ideas?   My mares have always had significant
bellies by this time.  Thanks.
Mary Ann
Tx