Contradiction

I literally JUST squirted the requisite 4 drops of pee on the bottom HPT and G-d damned if it isn't darker than yesterday's, and the one from the day before!

Problem: It is 15 dpo and my temperature just dropped, exactly as it would when I am about to get my period. I am nauseous, but that's normal too!!!

Shit, my temperature dropped, my back hurts, I feel like my period is coming..., but that line IS most definitely fuckin' darker; isn't it?? What does it mean? My fucking temperature dropped! Now I am so confused. I am watching it next to me and it IS VERY dark, but my G-d damned temp. dropped significantly, from 98.39 yesterday to 97.79 today!

I guess if I don't get my period today, then I will know after the beta tomorrow. If I do get my period today, should I go in for the beta anyway?? Again...the agony!

HELP ME!

Should I do the First Response test? These are Dollar Tree cheapies, so that I could test incessantly w/out losing my house. Should I buy more of these as I just used my last one, or should I wait and do nothing until tomorrow?

They did my IUI on a Sunday, why the FUCK can't they do a beta on a Sunday?

After all of this time, I longed to see a positive HPT, and now that I MAY have one, I have no idea if it's real...........