Hi, I am 39 and I have been trying to conceive for a couple of months. I usually have a period that goes full on for a week but my last period only lasted for 3 days and then light spotting. I did a home pregnancy test and it read negative. Over the last few weeks I have been getting hot flashes(more like waves) that last about 30 seconds then dissapear. I haven't sweated at all though and I thought normally with hot flashes you sweat. What can this be?