I have had intercorse just about every other day as soon as my period ended and my boyfriend has ejaculate in me every time . I have a regular 28 day cycle period but this time it was 4 days late then came the 5day. I don't have a heavy flow nor do I have a very light flow. It's a bright red with out any clots. I do have small cramping but not as bad as normal. What does this mean? Could I be pregnant? Is this implantation bleeding or my period?