Adhesion pains will last until they have torn enough to allow the expanding uterus to push the other organs out of the way.
Normally these would be adhesions free and able to move out of the way without pain, but when youhave not had surgery to cut all the critical ones before falling pregnant, these will be under pressure pulling on which ever organs they are attached to and it can hurt through the pregnancy to quite near to the end, from what I have read, but it must depend to a great extent on each of the adhesion's breaking point or tearing point.
They are tough as superglue and not stretchy, so at some point they will be stretched to the point where they do tear away if they need to, once that has happened and the wound has healed then you should feel less pains from adhesions as the pregnancy progresses.
Some will give way sooner than others. Probably best to speak to your GP about pain management options during pregnancy.
Endo itself will be acting just like the cells inside the uterus - they will thicken up a menstrual layer but not shed till you are ovulating again. Endo remains dormant through a pregnancy.
The cells don't know they are not in the womb so will be acting just as the cells in the uterus do.
There have been some previous posts about pregnancy adhesion pains but not many. Use the search box on the green bar to hunt them down.
You might have more of a response from posting on one of the pregnancy forums or somewhere like netmums, It's not just endo that causes adhesions- lots of things can trigger off adhesion growth in the pelvic area that would cause a painful nuisance in a pregnancy, so widen your search for tips from other mums who have been through this and you might get some useful ways to handle it.
Congratulations on the pregnancy - hope you aren't feeling too troubled for much longer.