Without more context, it's impossible to say. What are your combined incomes? Do you think you'll have kids in that timeframe? How much does RE cost in your preferred area? How much other money do you have invested?
In a 3 year timeframe, you probably are stuck with CDs or high yield savings account. Everything else is too risky.
But that's where the context comes in. If you're both doctors and will be making $500k/year, your $50k is meaningless. Dump it in some target date/lifestrategy fund and forget about it. If you're going to be penniless grad students for another decade, you might want to put it all in a CD.
-W