It’s about time that you began to understand the secrets behind effective stretching. The secrets begin with understanding what the process is.
The first part of the process, in the first 30 days, is that improvements in your range of motion in the joint occur because you tolerate the discomfort more (aka Stretch Tolerance) NOT, because you have lengthened the muscle.
Reference
Law et al, 2009. Stretch exercises increase tolerance to stretch in patients with chronic musculoskeletal pain: a randomized controlled trial. Find here
Andrew Stemler 
[…] As I’ve already explained, in the first few weeks of a stretching regime, any increase in the range of motion is due to an improvement in Stretch Tolerance. This gives you a transient increase in range of motion, and you’ll probably feel a bit looser. If you use stretching as part of a pain reduction programme, these short stretches will help build your confidence. But, no actual physical improvement in your muscle extensibility ( you’ve pushed open a rusty door and you are getting used to the grinding and stretching noise the hinges make) […]
[…] Its interesting to note that in the early part of a stretching regime, your range of motion goes up, not because you are more flexible, but you can tolerate more discomfort. […]