I am 50 and up until 2 months ago my cycle was as regular as clockwork. I am in a relationship and we accidentally had unprotected sex 4 weeks ago. ( to be honest I thought becoming pregnant was unlikely at my age and we had a few drinks too many and well....i just didnt think it was a risk. I am 50!) Anyway, I have done 2 pregnancy tests, both negative, so I assume I am not pregnant, but I am sick every day, I have gone off coffee, both the smell and the taste, I am plagued with cystitis and mood swings, my breasts are agony and still no period....is this the change or should I do another test to be sure?