Time to upgrade to another size? Pls read

So since I got married I noticed my boobs grew , I was always a cup size B but now I feel like my bars don’t fit but I haven’t got a size C because I’m scared it will be too big, also the bras I use are not padded at all there from PINK , and my boobs look good like if they were padded, but the problem is .... my boob like comes out from the side , and if I pull my bra to cover it , then my nipple will almost come out or come out , that’s why I think I need to get a C now but I don’t want it to fit big ... what do you think ?