My last period was on 04/29/13. It was a day late && unusually light. I wear tampons and usually i overflow especially for the first two days. This cycle much lighter than the norm and contained no blood clots which is also not the norm for me. It also ended a day early. I usually have a 5 day cycle and my periods are not irregular. About two days after my period i noticed a rusty brown discharge and thought of it as old blood. About three days after that, i just so happened to use the restroom and noticed three red spot in my undies. Lately i have had achy breasts. Sometimes i have cravings but i try not to over think it. Ive heard that females cannot have a period while pregnant but they can bleed some throughout pregnancy. Sometimes months at a time. My question is should i be concerned about pregnancy? Oh, i also took a pregnancy test this morning and it came back negative. Some women have also stated that they didn't show a positive pregnancy test until five months or so. I know my body well and this is very not normal. any advice would be great! thank you!