implantation

Destani
What are common signs of implantation? And when should I look for the signs?
I was ovulation from 3/10-3/13 as per the test I was taking. I had sex all 3 days (multiple times a day). It's not 3/17 and I'm starting to get headaches, I feel hot (my whole body), and I feel nauseous. I had "cramps" yesterday but they lasted for like 3 minutes... like I said a few other posts, this Is my first time TTC and I'm kind of stupid with all of this shit. I rather get advice from people who have experience and not google haha