Headed to Boston

I put on my running shoes and went on a 8 mile run.  I ran last night at 9pm and had a great run.  My leg didn't feel too bad and I felt like I could keep running.  Pain level was around a 2 on a scale 1-10. 

I went out again during my lunch break today.  I went 6.75 miles.  Not as great of a run as last night, but not bad too.  I felt a blister on my heal and it was pretty painful.  Ah man.  Not another blister.  Do I blame it on my orthotics or shoes?  Yuck........

What does this mean?  I am planning on running the Boston Marathon next Monday.  It won't be my fastest marathon, so I hope to really enjoy the race!!