Should I change my last name?

Keep your name OP. It's your name. And don't listen to any claptrap about your name being your father's name, not yours. No one ever says that to men.

happymummy12345, out of interest, did your husband ever consider changing his name to yours?

Your name on your marriage certificate will be the name you use prior to your marriage, and therefore you will sign it with the name you use prior to marriage. (Unless you change your name by deed poll before the wedding date, your marriage certificate is your proof of name change, so your name can't change until you have that (obviously that's based on a woman taking her husbands name solely. Deed poll is required for all other varieties of name change- hyphenating, combining names, same sex couples).
Personally I always knew I'd take my husbands name. It's just something that meant a lot to me. We'd discussed having a baby and getting married. We were lucky and found out we were having a baby. We then agreed we wanted to be married before the baby was born, so we were engaged for 3 months and planned the wedding in 2. I had my second scan after the wedding and the first thing I did was change my name so the scan pictures reflected that (I was gutted the first ones don't as we weren't married then).
I love being a mrs and having my husbands name. To me that's part of being married and I don't see the point of getting not sharing a name. I don't see it as just my husbands name, it's our family name.

he seemed a bit put out that I wouldn't want to adopt his name

Ask him if he'd be happy to change his name to yours. If he wouldn't be thrilled to do that, then he doesn't get to be put out at you not being thrilled either. And if he is thrilled to do that, then you're sorted!

(I kept my name. Reason: it's my name! Changing it would feel as weird as changing my first name.)

There is already a thread about this. I kept my name because it is my name.