Is it possible that 13 home pregnancy tests (which were all negative) over a span of 19 weeks be wrong. Or could i still be pregnant. I usually have late periods by 2 weeks or so and for the last two they have been late but this last one was late too but now it starts then stops, then starts again. I was just wondering if i could be pregnant. My breasts are a little sore but they usually are when im on my period. Please help I am scared!