I think I could be almost one month pregnant, but I'm not late on my period yet. I'm supposed to start on the 12th, so I've already taken a first response test that said negative. I'm just going to wait until I'm late to take another one, but I was just wondering what the signs would be at one month, if any. I've been eating wayyyy more that I usually do, and I've been extremely tired all this week. This could be nothing, but I just need some info on early signs

With both of my boys, I didn't find out I was pregnant until I was 6 weeks along, and I still didn't have any symptoms even then. My symptoms started around 8 weeks, and my main ones were cravings and nausea/vomiting.

Since you haven't missed a period yet, it is hard to tell if you should start testing or not. If you do miss it, wait about 14 days after the missed period and take an HPT, using your first morning urine.

Signs are different for everyone... most women expereince sore/sensitive breast and feeling tired. If your period is two weeks late take a home pregnancy test or go to your doctor for a blood test which is more accurate.
In the meantime if you think you are pregnant take prenatal vitamins and get your rest. Good luck.

Early signs are very similar to PMS symptoms.

Breast tenderness, nausea, enhanced sense of smell, etc. Most women wouldn't necessarily notice symptoms this early in a pregnancy. That being said, it's a very personal experience, and everyone is different.
I noticed symptoms around 5.5 - 6 weeks (for me mostly: breast tenderness and crazy emotions)