I have always been irregular with periods, but only been up to CD 34. I have had really sore breast and cramps like AF was near but I still have not started. Also I have been constipated. I took a pregnancy test on the 16th and got a BFN.. How long should I wait to test again? Is it possible I could be pregnant or is it something else. Its just my boobs feel like they are going to fall off and its been about two weeks since they started hurting..