Implantation symptoms?

Chelsea

Help! So I have been experiencing lower dull cramps since 5dpo on and off through the days. Then this morning (now 10dpo), took a test and it was negative. Then I spotted a little with bright red just now but my period is isn’t supposed to be for another 5-6 days! Is it possible that the these were implantation cramps with the bleeding now? And if it is my period, did anyone experience their cycles getting shorter and shorter when ttc?