Hello, I m concerned I may be pregnant and am not sure. My periods are always very regular and always a 30 day cycle. My last period was April 20 and I just got it but it was 6 days early on May 14. Day one was light, say two was heavy, and now day 3, light and almost gone. My period lasts usually 5 days. Light, heavy and the light on the last day. I have tender breast, nausea (no vomiting) headaches, cramps and back pain. Help me out, am I having implantation bleeding? Pregnant?