I have always been extremely regular with my period usually by like a day. My husband and I are trying to concieve. I have been charting my temprature to see when I ovulate as well. Last month my period started the 6th, I ovulated the 28th. I didn't start my period on the 3rd/4th like I would have so I toolk a HPT on the 5th. It came out negative. When I still didn't have my period on Friday I took another one, which was also negative. On Saturday morning I got what I thought was my period, bright red blood, but it only lasted the first half of the day. I spotted a little Saturday evening and Sunday morning but now it is gone completely. I read about implantation bleeding but it says that it is usually light and brown or pinkish. This was definitely fresh red blood. But I have never had a half a day period, and I am never late. But then again the HPT was negative. Could this be implantion bleeding? I know a HPT doesn't turn up positive until implantaion and I did ovulate late. I just hate to keep wasting money on HPTs if this is something else.