Nursing bras!!

Could I just wear a normal bra that I used to wear?? Maybe bigger ones will be needed idk. Because honestly struggling to find nursing bras that look comfortable, are actually affordable and not £20+ each, and don’t look like I’m a 90 y/o grandmother. Already feel like one so I shouldn’t have to have a bra that says I am one either. Given up looking for nice ones. So could I just use normal ones or is there a specific reason why it has to be a nursing bra?? I don’t mind the inconvenience of having to get my breast out a tad more than just unhooking something with a nursing bra.