I am 26 female, 145 lbs, 5'5 1/2, the last two months my periods have been different than normal. Last month, I had the regular cramping and it was shorter than normal, day 1 started the same as normal, day 2 was really light then it stopped for a day, and started again really light for one more day. This period started at the normal time, it started really light, then got heavier over night, its mostly brown in colour, except this time there was no to minimal cramping this time, which is unusual, there was abdominal discomfort though, that seemed to go around my body to my lower back, I thought I could be pregnant last month when my period was so short, I dont have many symptoms that would suggest that I am though. Although after my shower yesterday I noticed darker veins running from both shoulders across my chest, as well as a spider vein starting on the inside of my right knee, the chest veins faded throughout the day but the spider vein is still there but lighter. I did have some pulled groin muscle pain last week, started on my left one day, the next day my right also hurt, then the day after it was gone. Any idea what is going on?