Should be fine Your cold won't be passed on through breastmilk either - if anything, you'll pass on your antibodies so that even if the baby catches it it will hopefully be a milder version.
The quality/quantity of milk isn't affected as far as I know, but some cold and flu remedies may have an affect. Boots do an own brand cold and flu powder that's suitable for breastfeeding, and paracetamol is okay too.
Paracetamol fine, but some decongestants (I think) can have an affect on milk supply. Your baby will be fine, and will get protection from colds from your milk. If they do get the cold they can find it more difficult to feed when snuffly (DD used to sound like a little piglet).