First of all stop panicking!
Everyone is different and you had some meniscus work done as well which changes things. There is no fixed plan that each and every ACL reconstruction rehab should follow. And anyone who says there is, is talking out of their backside. I've been through this 5 times and never had an identical rehab path either in terms of the surgeon's protocol (2 of the ACLs were performed by the same surgeon), nor in my body's response to the surgery.
How is the swelling in and around the knee? This can go up and down and it will always cause variation to the flex more than it does extension. A common cause of increased swelling at the stage you are at is often due over-doing the exercise regime and not elevating and icing after each period of exercise. Concentrating on regaining quad strength this early on in your rehab cycle also seems a wee bit excessive. Your graft is entering its weakest phase now in the revascularization process, this is approximately between the 6th and 12th week post surgery. As it coincides with the period that many no longer have as much pain, it is not uncommon for patients to push too hard now and mess up the graft by either rupturing it again at worst, or simply stretching it by pushing it too hard.
You do not mention anything about your extension - that is the first and most important aspect to regain. Without full extension you cannot walk without a limp. Most protocols prioritize full extension before flex. Once you are walking with a normal gait (even if you are still on crutches), the flex tends to improve quite quickly as the normal walking gait helps reduce swelling even more.
It would help people to offer advice if you say where in the world you are - I am assuming you are maybe in the UK simply because of the time you are posting, but you could just as easily be an early riser on the east coast of North America or a night owl from Oz! This is an international site which is one of the things that makes it interesting to read about all the different rehab protocols. Not everyone uses an ice machine of any kind nor a CPM, so your surgeon did not deny you access to essential tools
I was just as happy with a couple of bags of frozen peas and a plastic bag on my foot to aid my efforts in polishing the wooden floors in my apartment
Made the heel slides way easier. I also used it for wall slides by lying on my back on the floor and placing my foot against a wooden cupboard door, then letting the foot slowly slide down the door until I had a 90° bend then I would hold it there for about 30 seconds to get the quads engaged before sliding it back up to full extension.