Me and my partner got physically involved on 3rd November and she got her period on 17th November ( heavy bleeding for 4 -5 days). It was two days before her due date. On 17th and 20th she took two pregnancy tests and both were negative. On 22nd she took another pregnancy test, it was negative as well ( only C line was pink) but the 3 HCG lines that are above the the display screen (marked in attached pic) become pink.. What does it mean? Can she be pregnant? Please help