My last period was 1st June. I am now 3/4 days late. Done a few tests negative. This morning, took my daughter to school, picked up cheap pregnancy tests from the corner shop, went home, peed on it (second maybe third pee of the day but I hadn't had a drink) I thought there was a very faint positive. I then noticed scratches on the screen so took the test apart and saw the faint positive clearer but then read you shouldn't take them apart. Waited an hour or so later till I needed a pee again, again not drinking, faint line came up straight away. Again very very faint though but it is visible. Came to work and picked up another test from a different store, peed on that one and it's negative. Dodgy tests? I don't know what to think. I've been feeling sick for 2 weeks ish. Stabbing pains in the very top of vagina/pelvic area. Also had slight niggly feelings in my right ovary. Any advice please