If somone has bad sinuses and sneezes due to an allergic reaction to drinking milk could you get a cold?

Question

if you were in their vicinity?

Answer 1

Only if they have an active virus or infection.  You won't catch a cold based on allergies.

The hard part is though, someone may have active virus or infection with no symptoms during the gestational period before they actually get sick.  If they actually get sick in the next up to 14 days, then be worried.