Dalam Process Implantation Ke?

Hi mommy's.. My period is irregular since August and was hoping that time im pregnant but actually I was not. This time i had my period for 3 days (30/11/2019-2/12/2019) and i had sex with my hubby the next day after my period ends and 9th december was my ovulation according to the app. And we had sex again on the day. Right now I'm feeling lower abdominal cramp and headache. Is it implantation process or it just my mind? I'm afraid to do the test because don't have the strength to get hurt again.