Well, you obviously would know if it were a possibility. If you had any intercourse this past month, then it is a possibility. If you didn't, then don't waste your money on a home pregnancy test. Some of those symptoms sound like a virus or cold and definitely not pregnancy, (stuffy nose, tickle in throat, cough).
Sometimes, those who have very regular periods will be late by a couple of days once in a while. 2 days late is not really late since cycles fluctuate by a couple to a few days in either direction.
Hope you get feeling better.