Even if you get a blood test, it doesn't mean you're in the clear. I know that's hard to hear, but a blood test wont make you feel any more secure. There will ALWAYS be something to worry about from here on out.
This. A blood test today would confirm that you're pregnant. Today. Unfortunately, it says nothing about tomorrow or any day after that. Sometimes you just have to trust that things are fine because there's no way to know 100% every day.