Question

Ok I was wondering if anyone experienced this or knew someone that did bc one of my close friends thinks she may be pregnant they havent been trying but also not trying to prevent it they have been maried for five years so she wants to be if she is but right now she thinks she may be she bought a pack of two tests and took them and one of them come out positive and the next day she took another and that one was negative. So she bought a pack of two epts and again the first was pos and the second neg so she bought clear blue and both were negative well she went to the doctor to get a preg test done it was neg. But theydidnt do a blood test cause she didnt tell them she had two pos test. But I have always believed that the test were pretty accurate as far as when they say positive but sometimes inaccurate when they say negative beings sometimes u test to early so it could say neg. When u really are . But I dont want to tell her that n get her hopes up. So anyone had this situation happen and what were the results??? Or anyone have thoughts or advice?