45 Days Late, Pregnancy Symptoms, Negative Test

I'm usually pretty irregular, so I didn't think much of it when I didn't get my period after the 28 days. However, once my boobs started hurting, my whole body started aching, my scent heightened (and became rather irritating), and I began cramping and spotting with no period immediately following, I checked to see just how long it had been since the start of my last period. 45 days was enough to get me concerned. My boyfriend and I aren't trying to get pregnant, but since we've been using the POM, I guess we haven't been trying too hard to not get pregnant. I took an at home pregnancy test 2 weeks ago and it came out negative, but now I'm worried that I took it too early. I also had a UTI not too long ago, so I'm worried that may affect my urine hormones. I scheduled a doctors appointment for Wednesday, but since that's 5 days away, I'm a little anxious. Has anyone gone through this situation, and if so, what was your outcome? If I'm not pregnant, I'm really worried about what might be going on with me. What questions should I ask my doctor if that is the case? Thanks!