Quoting Brendan&Bethany'sMom:" NOT trying to scare you but it could be a miscarriage... sounds similar with the low pains. But I would ... [snip!] ... gonna tell you if somethings wrong. And sore nipples and such come on a little later in pregnancy... go to your OB and ask. "
She wouldn't be having a miscarriage 12 days after her period. There's a pretty good chance she hadn't even ovulated at that point. Also, sore nipples don't always come "later" in pregnancy. They were one of my symptoms, before I even got my BFP.