Implantation?

Je

Hello Everyone!! I completed my first round of Clomid Cycle Day 3-7. Then I had my HCG/TRIGGER Shot Cycle day 16 after seeing a good size follicle during ultrasound. Today I’m 7days past Trigger & have been experiencing light to mild cramping & a pulling of stretching sensation for about 2-3 Days now. I’m not sure what this is. Could this be implantation? Or my period getting ready?! & I’m really anxious! Please HELP!