I have to agree it sounds as if you're in what is certainly at least becoming an abusive relationship.
Stealthing - not using a condom when he's told u he will be/is is illegal and is a form of coercive rape.
Frankly at your age I would strongly advise you dump his sorry arse!
My dd isn't much younger than you and I would HATE her to be in a relationship like this.
She has dumped guys for much less dodgy behaviour in the bedroom!
He clearly either doesn't understand or more likely doesn't CARE about consent or about your wish NOT to become pregnant.
You already have a 3 year old, you know how much work a baby is and you have many many years to have another child if you wish to.
I'm also fairly certain you're not married to this guy and marriage hasn't even been discussed? If so what is YOUR PERSONAL financial situation and job situation? Because as I'm sure you already know from having your dd, having a baby impacts and slows down career development and income quite significantly.
Any DECENT man:
Understands, cares about and follows good behaviour regarding consent
Proposes or discusses marriage before children
Doesn't guilt trip/gaslight etc the potential mother of his child!
Get rid op you CAN do better - I'm guessing he has you convinced that as a young single mum that's not the case. I was a single mum throughout dds childhood and numerous friends/family are/have been single mums too and I can assure you there are plenty of decent men interested in dating single mums AND there's nothing wrong with remaining single either.
Dump the loser!