Hello, I Am 40 And And Experiencing Irregular Period For

Hello, I am 40 and and experiencing irregular period for three months now. I always have terrible cramps and boating on a 28 day cycle. Three months ago my period was very, very light, I took a pregnancy test because it was so very light but it was negative. The following month was a normal, cramps and all period. This is the third month and I have all the sign of a period, bad cramps, bloating, emotional but only light brown spotting. I was due for a cycle on the 29th.