Any last minute weekend getaway ideas?

Im trying to get away for the weekend Thurs Fri Sat leave Sun. I live in Maryland about 15 minutes from DC. MY boyfriend and I just wanna get some alone time, we just found out that i am pregnant and haven't had time to each other for a while. So we just wanna relax , possibly on a budget not cheap cheap but i don't wanna loose my babies college money lol im 4 1/2 months prego if it matters. We love going places that have alot of history, musuems , monuments, stuff to look at and learn, free musuems would be awesome but you can t get it all. Just trying to find a place that has alot to do for us well more like a sports , beer fanactic and my prego lol THanks Everyone.