I am 4 weeks late on my period, I have taken literally tens of HPTs and they were all negative. But I am breaking out and overly emotional. Sore breasts and food cravings. My OB GYN seems to think its nothing, But I have a friend who didn't get a positive HPT until she was 4 mos! I was pregnant once before but I didnt know, I was a smoker and still am, so I lost the last baby because I didn't know until it was to late. I'd really like to prevent that happening again. SOMEONE PLEASSEEE give me some advice on what this may be. Iv never had an irregular period in my life. It always comes right on time, the first wed of every month. Help? :-(