Im an ex-junkie, who has relapsed, and needs help telling if Im pregnant.?

I was addicted to oxycontin/heroin for about 2 years. About a year into my addiction I lost my period until sometimes when I would withdrawal (when I didn’t have my drugs, couldnt afford it, etc.) my period would come back for however long I withdrawaled for (a day or two usually). I began detox on June 13, 2009. I relasped 8 days later. But through those 8 days my period did not come back. On July 11, 2009 I tried detoxing again. I have relapsed again 8 days later. And through those 8 days, again, my period has still not come back. I have been using again since July 19, 2009. Im not taking as much as I did before and Im going to try detoxing again. My fiance and I have been trying to have a baby, but with no period for months now, am I even able to concieve? I think I might be pregnant though, I have a few of the symptoms, slightly tender breasts/nipples, weight gain, am usually constipated, but right now I have diarreha, frequent urination, slight cramps in my lower belly, cravings and some of the foods I usually like I dont wanna eat, and I can smell everything. But I took a home pregnancy test and it came back negative, I have another one and Im going to test again tomorrow morning (when my urine is the most concentrated). Please help. I dont know if the no period coming back after trying to get clean, means that Im pregnant or if I have just really messed up my body to the point that my period is never going to come back.

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