Hi, me and my girlfriend had sex (Unprotected) over a month ago and she's been having pregnancy symptoms ever since, fatigue, nausea, vomitting (A little), dizzyness, sore breast, cravings for food she usually hates, and hating food she usually loves and wont eat it based on smell alone. We both thought she might be but she had her period, like she usually does, but the symptoms were still constant so she took a pregnancy test and it was negative. Did we take the test too soon or is it something else that could be causing all the symptoms, any thing  u can tell us will help a lot, thank you