hello and thank you for asking HCM,
I understand your concern and these symptoms could be signs of pregnancy
. But if your pregnancy test was negative, perhaps your period is just delaying and you are having premenstrual stress
syndrome (PMS). You can take an another test and if this is also negative, than the result is surely negative, but to be calm I suggest you to visit your doctor and take blood sample to be sure.
I hope this answer was helpful to you.