Is it possible to get 3 negative home pregancy test and get a positive blood test. I'm on cycle day 46 and I haven't gotten my period but also haven't gotten a positive home pregancy test. I went and had my blood work done today to see. I'm waiting to hear from the lab. Is it possible. I have cramping on my right side and some back pain but don't feel like I'm going to start. What do you think?