Is there still hope?

Has anyone ever become pregnant and then bleed like you started your period, but everything was fine with the pregnancy? We've been trying for so long and I am completely meticulous about my cycles and I know that this time is VERY different. I bled on my period due date but only for 7 hours, only cramps in my back, I've been so nauseated and the headaches have been unbearable. This is nothing like my normal period and I know I'm really reaching here but is there any glimmer of hope for us? We've been trying for over 2 years.