Help! Please read even though it's long!

Im so sorry this is long. My husband and I are TTC our second child... I was on the Depo shot & got off of it due to no sex drive I was switched to a pill where I was spotting everyday for TWO months. My husband & I talked about it & decided this was a perfect time to start trying but now I've had NO period or even spotting! I've been have HORRIBLE headaches bad diarrhea and my husband smokes and I'm not outside with him when he does but when he comes in he smells like it and I instantly feel nauseous. I have taken a pregnancy test but nothing. :-( I am waiting for an opening with my doctor because I had to switch due to our insurance changing. Please no negative comments about my hubby smoking he knows how I feel about it! Any insight or help would be great!