Early signs? Trying not to go crazy!

Hi ladies! I have a question. Lately I haven’t really been feeling myself. I have been getting headaches, lightheaded, i have been really tired and have been experiencing some stomach pains, and at my lower belly is kinda tender and have been somewhat constipated but I drink a decent amount of water. I did get my period last month and I’m due to get my period in a few days but you know... once you’ve got pregnancy on your mind it’s pretty difficult not to think about it ALL THE TIME! Now I know I’m going to have to wait to take a test even though I’m DYING to take one now just to see but I was wondering if anyone has experienced this as an early sign of pregnancy? Also, the stomach pains aren’t like period pain.

So, I’m just wondering🤷🏽‍♀️