No period a negative pregnancy test

Ok so I’m 17 days late for my period my last period was Jan 23 ,2021 it last for 6 days my cycle every month is 27 days so i went to the hospital on feb 28 for abdominal pain the doctor ask when my last period I told him then he ask u think u might be pregnant and I said I’m not sure so they did a pelvic exam, blood pregnancy test and urine pregnancy test came out negative but the only thing was positive was a std I got and I had a uti also but the doctor gave antibiotics for it but it’s March 6 ,2021 still no period ugh please help any options please help I’m only 30 with 4 children the doctor told me to follow up with the ob gyn doctor ugh help