Hey - I understand exactly what you are going through. My dd has been on solids for a few weeks now and got really constipated just over a week ago. I think she only went a few days without a poo, but then we had at least a week with wee solid poos. I stopped the baby rice, fed her prunes on two consecutive evenings (Monday & Tuesday), with swede, parsnips and some broccoli for lunch (cutting out carrots, apple, butternut squash). It was yesterday (Thursday) that we finally saw the explosion. So, don't worry if nothing happens right away - it will happen eventually!
I am now going to reintroduce different solids and watch out for the ones that cause constipation!
My ds was worse than this. He had bowel problems from birth (and was breastfed) and he would go a couple of weeks without pooing. When it did happen, it was something to see! We knew when it was about to happen as he got very fussy.
Good luck