For the last few months i have been late on my period by about 3 days. I am on the pill but i have forgot to take once. I have put on a bit of weight and my period is like a very dark brown colour and very light. it lasts about 4 days. I get awful stomach cramps. Im worried im pregnant. I have not done a test yet cause i dont think i would even have a period if i was pregnant but now im not sure, please help