I'm hoping these earthquakes are just blowing off steam and relieving the fault line instead of tremors to a bigger one. This is coming from my town so I get a little anxious. This is the third small one in four days.
Some experts are expecting a 6 or 7 magnitude earthquake on the Hayward fault soon. This would not be pretty as the area has a large population.
I've been getting a lot of migraines since right before that Oklahoma one and that explains a lot. I won't go into detail though--it sounds really silly.
Read about the small San Francisco earthquakes here.