lump on belly

I bought a 2 1/2 mth old JRT a few days ago from a pet store. She's a very active and happy pup, but sadly, there are a few problems with her.

Yesterday, we found a soft lump on the underside of her belly. We're concerned but due to financial problems, we're only able to send her to the vet 2 weeks later. Is the lump life threatening? I tried pressing on it gently and she doesn't seem uncomfortable. Also, she doesn't appear to be affected by the lump, though there's been traces of blood in her faeces, which is slightly watery. And,her belly seems to be slightly bloated.