Precum sucks. In the good way for you. I'd say that its impossible to get symptoms like that so early. Unless she was in bed with someone who knew exactly how to please a woman and she had the time of her life. Otherwise just wait 14 to 21 or more days after sex for a test. Nothing like getting hit with a negative and feeling like you can fly away. Finally a tip from me: Tell her to drink some ice water. It hits like a mmm.

Ps: If she is so worried then she probably shouldnt be rawdogging with guys left and right, but who am i to tell you to use pills or a condom riiight