pregnant?

me and my boyfriend used the pull out method for a while. He never came in me ever. I’m aware precinct can pick up left over sperm but it’s very unluckily to get pregnant from it, however not impossible. I’m 28 days late and counting.I’ve had sore boobs for about a week, not really bad though. I’ve had slight cramping here and there. Other than that I’m showing 0 signs of pregnancy. I have just been going through exams for the past month and have been very stressed so it could very well be that. I’ve taken one test it came out negative I’m going to take another one soon. I’m starting to get really worried. Do you reckon I could be pregnant ??