I'm 24yrs Old. I've Always Been Irregular But The Past

I'm 24yrs old. I've always been irregular but the past 10months has changed and my period has become regular. I've recently found out That I have a mild high prolactin levels ranging in the 30s. My last period was Sept 4. I'm about a week late. I tested today sept 11 and got a negative test. My dr called me yesterday on sept 10 to tell me my prolactin levels are slowly dropping I'm getting a blood sample done in 15 days to see what levels are than. The past week I've been feeling fatigue , very nasaeous , threw up a few times, abdominal soreness and get dizzy. I spotted very lightly over a week ago when my period was supposed to come but never came. It was more like brown discharge like a few times in that week. I'm confuse wether or not I'm pregnant if I tested negative with a cheap pregnancy test from Walgreens.