Why Did I Get Pregnancy Symptoms Despite Showing Negative?

Hi i am a 28 year old female , my husband and i just recently just started to try to have another baby i graphted out my period and i found out when i ovulate and we have sex on those days thinking that we would get pregnant but just last month i got my period oh so i think , ir could have been bleeding i dont know all i know is that i am feel pregnancy symptoms( heartburn , dizzines , fatigue , increased appetite , vomiting and nausea and increased urination ) and moving in my lower abdomen i have been pregnant already so i know how a baby feels and it feels just like a baby does , anyway i took a pregnancy test last month and it was negative so can somebody tell me was wrong or was goin on ?