I took a pregnancy test about 12 dpo on a 15ml pregnancy test it was a faint positive, then i did the same one again that night and it was another but more faint positive, then next evening i did a predictor test whcih measures 50 ml and it was negative, well there was a faint line but so hard to see. I needed to look in the light and could barley see it. My period was due yesterday/today but know sign. Anyone experienced this