Is it possible that im pregnant?

I had my periods on the 30th of may but they wern't heavy witch was unusural but this month bout a week to 2 weeks ago and now ive ben throwing up my stomach is bloated and im getti tired alot and i had a bit of cramping but thats gone and has some brownish/pinkish discharge my breasts r sore and im due for my periods in to days but im not gettin any sign of them at all i did a home test that came bk neg last thurs i went for blood test that came bk neg but i was wondering if my hormone level for being pregnant is low cos my partner blows pot in my mouth.