So I am a smoker of both cigarettes and weed, and for the last week every time I try to smoke a cigarette I feel sick my stomach starts to hurt, I get light headed and sometimes get headaches, but am completely fine when smoking weed. Could this be a pregnancy symptom.? My period shouldn't start for another 5-8 days so I'm waiting to test, did anyone else get this before getting a bfp.? I just want to know so I can stop smoking cigarettes if it is a symptom so I don't harm or disrupt any growing that could be going on.