I’m self Employed and I plan on taking only 12 weeks off when the baby is born - I wish I could
Take more as I really wanted to try breastfeeding and bonding well
First and foremost, going back to work early needn't damage your bond. I had to go back full time after 10 weeks when my first was born (don't live in the UK - different rules, no maternity pay even, although this was some years ago) and I breastfed until DC was 13 months along with some bottles during the hours when DC was at the childminder's.
However, this is about where the good news ends in responding to your post. This is horrific. In the time when my first DC was born, I was also the main salary in the marriage, and with no maternity pay of any kind in my profession where we were at the time, we had to use our savings to pay for a lot of things until my 10 weeks was up.
BUT (and it's a big but) my DH was fully on board. He earned less than me at the time, but we were joint in everything. He woke up with me in the night when I did night feeds. He did his fair share of pacing round the kitchen table with a screaming 1 month old who wouldn't go back to sleep. He still went to work the next day without complaining. Money was never mentioned as being something that was now 'his' and no longer 'mine'.
You - to use the old mumnsnet phrase - have a DP problem. You need to feel fully supported at this time, not made to feel like a financial burden for a life you both created, not just you. He was on board when he was having a 'good time' making a baby - well, now he has to be on board for the difficulties, or he needs to accept you will go back to your family.
Look after yourself and your baby first and foremost. Do whatever you need to do.