symptoms

So I am due my period in 6 days, yesterday I had spells throughout the day of feeling nauseous & sore boobs, today has been the same just the nauseous is stronger & boobs have been sore longer as well as needing to wee a lot more frequently & urgently (not a UTI). After having sex during my ovulation time, I started to experience cramping afterwards which I have never noticed happening before as well as feeling very sensitive & emotional. I have just taken a pregnancy test at 19.25pm & it has came back negative. Any suggestions please?? Really confused 😔