I had cramps for the first 2 weeks it seemed like. And then i have had them on and off for my entire pregnancy. This is normal. If you start to bleed or if the cramping become unbearable then go to your ER. This could be a sign of miscarriage or ectopic pregnancy.
Since you are this early in your pregnancy its not uncommon to get a negative when your not using first morning urine. The blood test is 100% accurate anyways so listen to that.
I'm in the same boat. I think its just like our tummy's, they are both stretching and that is what is making them itch. Mine itch and i know that it isn't an infection either.
What time did you take the first one? If you took that one anytime before noon and then you taking the EPT at night can be the reason for why you are having different answers. By 6 your urine can be diluted so you can get a negative when you really have a positive. False positives are very rare...