it's been 36 days since my last period, generally my period runs about 29-30 days, almost NEVER more, I don't think I've been really stressed and I haven't lost a lot of weight since about a month ago, an even then just a few pounds, I'm not incredibly stressed more than the norm. Lately I've had a slightly tight feeling in my lower abdomen (below my belly button), my breasts have grown (more than with my period) and they are sensitive but not necessarily sore, I've had strange and random cravings and a few aversions, I have a little headcold so I don't know about my sense of smell. Could I be pregnant? I took a test on the third and fifth day of my missed period and got a negative, Help would be much appreciated?