Some women get bleeding from the bean burrowing into the uterine lining.
Some women see an Implantation Dip in their temps during the middle part of their luteal phase. The rule of thumb is generally between 6-12 DPO... although I saw a chart the other day that had an implantation dip at 4 DPO!
Some women also feel implantation cramping from the bean burrowing into the uterine lining.
Unfortunately, there is no sure fire way to know with 100% certainty when or if implantation has taken place.
Either way... the temp dip you are currently experiencing is in the right time frame for implantation... so it's quite possible that you've got a little bean implanting right now.
Best of luck to you and I hope that helps!!