implantation bleeding

I need help guys. So the last three days when I went to wipe there has been a brown tint. My period is in 7 days from today when it first stared my period was in 10 days. This never happens the week before my period. I have been having stomach cramps, my back has been hurting and my boobs are hurting. Could this be implantation bleeding?? Help please I'm new to this kinda of stuff and am just wondering. Been TTC for about 9 months and have been really wanting a baby.