The recent data is higher rates:
https://tradingeconomics.com/united-states/mortgage-rate
There's some seasonality to the yield curve steepening in September and January though.
Yellen is going to hike fed funds again in December. Probability very high based on market expectations via fed funds futures contracts.
If the economy started weakening all of a sudden, rates on the long end would pull back down a bit, but there's still no signs of recession at the moment. Unemployment is ticking up higher in some areas like Orange County and San Francisco County, but nationally the average is still very low.
If Trump fails to pass tax reform that could have long end rates pullback a bit but so far that seems to be humming along. Still, to assign a probability to that outcome is futile.
A lot of the guys who made their billions in the bond market are calling for higher rates and that the 30 year bond bull market is over.
End of day, 4% is still ridiculously low. My concern would not be rates, but elevated asset prices and a potential recession. We're on year 8 of expansion, the longest in history has been 10. Is this really the best time to buy would be my concern. But if you're starting a family, producing some children, I guess you have to buy regardless of price.