Serious....

Does anyone feel like it's their fault for not being pregnant? I just got me period... its light spotting but it's there. I thought I was for sure pregnant but kept it to myself... now that I'm not, I told my husband I was spotting and he was down but supportive. I dont know what it is but I feel like it's my fault. All I keep thinking is maybe I drank alcohol too much or drank too much caffeine, maybe I smoked too much , maybe I took too many hot baths (which is my favor), maybe I'm too fat ( I am currently at 255lbs the highest I have ever been), maybe I'm too stressed out. We are trying to sell our house and my husband is in the military so not only are we selling but he also has a deployment coming up right after Christmas. The only reason this is super stressful is because he just got back 3 months ago. The thing is, my period was late.... 8 days... took a test, it was negative. Waited a week, took another.... negative. Yes it's been 2 months in the trying process this time around but I'm so sad and depressed right now that everything is my fault. I just need some insight honestly so I dont feel so depressed in the future