Hi, I have a question. I have a 25 day regular cycle and am very familiar with my body. This cycle I am 4 days late on my period. I did HTP, but it was negative. I have had strong cramps for about 3 days, which now alternates from left and right ovary and feels more like pinching. I have some bloating and enlarged breasts, but I suppose could be hormonal. Could I be pregnant, or is there any other medical explanation such as a cyst for my missed period?