What's going on with me!

I'm cramping & my body temp is super low. Idk where the heck I am in my cycle, I think DPO means, post ovulation something? Idk. Im so confused, but all I need to know is could I experience implantation cramping 1.5 weeks after sex? Is this ovulation? (Pardon all the ignorance. This is our first time TTC)