What are the signs of pregnancy?

I’m a mom to a six year old boy, and I’m on my second round of nexplanon but it’s due to expire this year. I took a clear blue test on Tuesday night and it was a faint positive within two minutes, I have since taken 3 first response tests and they all came back negative. I’ve been cramping in my back and my lower abdomen. And going to the bathroom more frequently than I usually do, and I’m so exhausted. What do you mamas think???