Implantation dip?

Sorry I couldn't provide you with more temps but I didn't decide to temp until after I read about the implantion dips, then started doing early morning temps before getting out of bed.  Ever since 1DPO my daytime temps have been in the 99's and in the evening of 7DPO I noticed a slight drop. 8DPO my temp in the morning dropped significantly and continued during the day as well.  9DPO My temp rose again, could this be implantation??? This would explain the headaches, mild breast tingling, cramping.  My cervix is med, soft and med clear CM.