15 dpo negative test

I’m 15 dpo and this morning I woke up at 4 am and took a pregnancy test and it was negative. I’ve been having symptoms like sore breast (you can even see some vains), cramps but not like my normal period cramps, nausea in the mornings. It says my period was due yesterday and she isn’t here so idk what to think. We have been trying for 3 months now to conceive so I’m really hoping this is my time to shine but the odds aren’t looking promising. Any advice would be appreciated 😊