Hia,
I had a cold for one week before my BA and still had it when i went in. I spoke to the nurse as soon as i started to feel unwell and she told me what to take. Call the nurse and find out ASAP. Eat lots of fruit and veg too!
I went ahead with my BA but its up to the anesthetist if they think you are well enough to go ahead. Dont worry too much just seak to the nurse ASAP!
Hope this helps!