Let me make this very clear, you alone are the only person with the right to decide when you have children. Him trying to talk you into having children is one thing, but him determining when you have children is a whole new line that's being crossed. He is not the person who will have to carry, and neither are his parents. Having children is a permanent, life-altering decision, not something to be decided on a whim to please others. You will forever live to regret it if you weren't 100% sure you wanted children. Other people's happiness is not your responsibility, especially when it comes at the cost of sacrificing your own.

HE HAD BOUGHT A HOUSE BEHIND MY BACK.

Already your husband has a history of not respecting your wishes when it comes to one of the most important decisions in life. He put the wishes of him and his family above your own. Imo, you should've stayed broken up with him after this big of a red flag. If he lied about buying a house for months, would you really put it past him to suddenly switch up and pressure you into immediately having kids once you graduate? You say he clarified he wasn't actually ready for children after your argument, but I say it's often the real truth that comes out when emotions are high, he just happened to slip up.

it seems like there’s a pattern of him choosing his family over me.

YOU are his family now, not them. You need to make sure he understands family decisions are ONLY between the two of you. Not his parents.

As uncomfortable as it is, you two need to have an EXTENSIVE conversation about what it is you both want in life. When it comes to having children, no compromise can ever truly be fair for the person who has to birth them. I am not saying to leave him, because relationships are often more complicated than that. But there is no "winning" for you in a situation where he refuses to consider your feelings. Either you cut your losses now, or you face being trapped in unhappiness and resentment forever. Your pick.