I did a C25K starting last September. It was supposed to be an eight week thing and it took me at least twice that long. I don't run every day, I don't even run every other day. And sometimes I was stuck on a day for three or four tries. I believe you should listen to your body and take your time. But also for me (and not everyone is the same so your experience might be completely different), I sometimes need to just push myself a tiny bit to get to the next level...just don't hurt yourself.
Also, I don't know which program you are doing...I did a phone app and it seemed to advance very very fast. When I started looking around at SparkPeople and at other apps, I actually decided to change to a different program that wasn't as aggressive - the new one that I picked worked much better for me - make which ever one you are doing YOURS and tailor it to your needs and fitness level - and if it isn't working for you, consider looking into a different one that might suit your level better. This is about you and you should feel good about it. It is VERY hard but it is worth it in the end.
"I always prefer to believe the best of everybody, it saves so much trouble." Rudyard Kipling
"The only disability in life is a bad attitude." Scott Hamilton
"Most folks are about as happy as they make up their minds to be." Abraham Lincoln
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