It's so crazy how little things like this could be a sign but yes, it never happened to me but my friend had it happen to her around the time she got her bfp!
When I was trying to conceive and about 8dpt I got a really stuffy nose and cold-like symptoms....a few days later I got a BFP. I was told "cold-like" symptoms are a "un-listed" symptom of pregnancy....
I am on 10dpo and on 8dpo I had the samething happen to me...also very sore nipples and some mild cramps