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my cycle usually has been 30 days. last month it was 33 days. it has been 43 days since my last period and nothing. my br___ts have been sore for past two weeks. i took two pregnancy tests. i took first response test a week ago at nite and it said negative. i took it this morning with my morning urine and it said negative. is my cycle screwed up because it was irregular last month? why are my br___t sore for so long? im not having any other signs of pregnancy. should i take a different brand test in a couple days or is first response reliable? i am not taking any other medication. i am worried. i need some help! thank you!