Theme Hell

Would hospital care after minor dog attack injuries expose a first trimester pregnancy?

Details:
I have a story I'm currently working on set in a modern type world, and a plot point where one of the two main characters is attacked by a pack of street dogs and gets some minor scratch and bite injuries. I'm thinking just a few stitches at most. I can guess they'll need "just in case" antibiotics and rabies shots because of the bites, but would common care involve any tests that would expose an early pregnancy?

Goals:
I'm trying to keep the pregnancy a surprise for the other main character later in the story, so a "some hospitals would do these tests but some wouldn't" could be ruled that this time it wasn't done. But if it's very common to do certain blood or other tests that would easily reveal a pregnancy, that's a problem. And having the other main character who's acting as their savior/caregiver in this scenario decide not to get them treatment wouldn't be in character or suit his arc in the story, even with minor wounds that in theory could be treated at home.

Do I need to change details of the attack, or depict this medical team as negligent? Or is the stealth of this pregnancy safe?