You should take another pregnancy
test and also see your doctor for an examination. Early pregnancy may not be detected by HPT as they are not so sensitive. Your symptoms are not typical of pregnancy, they may also be due to excessive progesterone
release as happens before the onset of a period. Yet, your last period was 2 months ago and if you were having regular cycles before, it's time to check if everything is fine. You may also need a sonogram. Good luck.