Congratulations op 
You actually sound like you have very little left to buy, yet are still pretty early on in your pregnancy, so well done for that! It sounds like you can start knuckling down now to save.
I would definitely cancel sky and get prime or netflix - its a fraction of the cost yet has so much to choose from. Binge watching is perfect for maternity leave anyway
We cancelled Sky, they since offered a very cheap deal but we decided it was still more than we are willing to pay, so are sticking with Netflix.
I am unsure why you are spending so much on electric. We are a family of 5 in a 4 bed detached house and spend £50 a month tops on our prepay metre! You definitely need to have a think about why your bill is so high. Do you use your immersion heather a lot? Or a tumble drier?
Look at phone contracts. We have tesco pay monthly that cost us about a tenner each.
If you change your internet supplier, go through a cashback site, we got £80 refunded when we moved to plusnet - whilst also saving a tenner a month!
Don't move the 'next to me' around, get a small moses basket or if your pram has a good quality, lie flat carrycot, then use that downstairs.
Meal planning and batch cooking saves a fortune!
Look at all insurance policies, note in your diary when they are due for renewal and prepare to shop around - again try cashback sites too.
Can you or DH work overtime over the next few months? Or take on a 2nd job short term, eg delivering take aways? When I was pregnant, I took on a zero hours job showing people to their seats in our local concert venue. Got to watch free concerts as well as earn decent money haha!
Just throw one thing in with your groceries each week - eg a packet of nappies/maternity pads/baby wipes/cotton wool/nappy cream etc - you really won't notice the expense then as its just a few pounds a week, but will help you to stockpile the essentials.
You do not need everything now! Seriously, you will get given so much stuff, you will end up with too many clothes etc, I promise! Just buy the bare minimum for now. You will likely receive gift cards etc too remember.
As you plan to breastfeed, don't buy a lot of feeding equipment yet, til you see what you need. You may never need a steriliser or bottles, but even if you do, they can be easily picked up when needed. Don't bother with a breast pump yet either unless you see a really good deal. If you are only needing to sterilise occasionally, it will be cheaper to just buy a a couple of bottles and a microwave steriliser.
Good luck op, we have all been there. At least you are incredibly organised 