[shimmeringfaerie]

The best thing to do is to take the test now. If you're not pregnant, then you're just wasting all this energy worrying about something that might not be happening. And it would take a lot less energy to take the test.

If you are pregnant (which it doesn't sound like you are, if you used other protection before getting the shot), then you can start to deal with that and process it. I still think finding out for sure would be less stressful than all the "what ifs".