Pregnancy Signs?

So my Period is a bit late. According to glow. I've had to press the "my Period is late" button twice already. I usually only do once or never because it comes early. But obviously now it's a different story. I have been having unprotected sex. He has cum inside me. We usually get the pill but idk. I'm having emotional break downs, cravings as always, but today my back started hurting & I'm just curious to think what you all think. Me personally feel like I can't get pregnant because in all honesty I've tried. Nothing yet. Idk kinda scared to find out on Monday whether I can get pregnant or not. If I'm not already. Hope this makes sense. What were your signs of pregnancy?