Talk to Gynecologist on Confusion

I had my period on 28th March 2018 and after that I have missed my period for April. I did my pregnancy test (HCG) at Agha Khan Labs on 3rd May and my HCG levels were 2.59. So I assumed it as negative. I am feeling an increase in appetite, hunger but nauseous during the day and sometimes even headache. Lower stomach and lower back pain is also common these days. Yesterday I noticed brown discharge on my underwear so I started wearing a pad thinking maybe my period has started. But Im not getting proper bleeding just a line or two of brown blood I would say. I don’t want to do another blood test so soon but I think I could be pregnant. Please can you help, I’m so confused.