My puppy is 6 months old. She is set to be spayed in two weeks, but her nipples recently got a lot bigger and I was wondering if she could be having a silent heat? There is no blood or discharge or anything. She hasn't been around any male dogs since she was 3 months old, so I know she's not prego. I was going to breed her but was talked out of it, but now I'm worried that I'll have to move her appointment. How can I tell if she's in the first stages of heat, or a silent heat? Can I still get her spayed if she IS in heat?