Before bailing because the rate changed 0.25-0.5% see what buying a point would cost. It might be a few thousand dollars, but honestly rates might 'keep' going up. If you are waiting for mortgage rates under 3% again you might never see them, ever. These are historically low rates. They could happen again, but there is a chance they might never happen again. Get it while you can.
Reasons rates might keep going up in order of importance.
1(and this trumps Trump). The fed has already signalled they are likely to raise rates in December.
2. Trump's spending plans. He wants to increase spending on infrastructure, the military, etc. This can lead to inflation, which leads to higher rates.
3. Trump's tax plans. He wants to lower taxes substantially. Combined with 2, you are looking for the potential for inflation, but also a lot more borrowing. More government borrowing will likely to lead to higher rates, especially if the Fed isn't buying the debt to keep the rates low, which they likely won't be(see #1).
4. There isn't a non-political way to say this. The stupid things that come out of Trump's mouth. During the campaign Trump talked about renegotiating the US government debt. I could write a paper on how stupid this is. Luckily, so could Trump's advisors and they had him walk it back immediately. Then he said it again a couple weeks later. If he said something like that after winning the election, when people would actually take him seriously, you might see interest rates spike even more. Expect them to be volatile up until he takes it back again.