Implantation Cramping ?!?!

Zuleyka
Hello Ladies,
We have been ttc 3 months now this was the first month using opks. I got a positive opk on Tuesday and got busy almost everyday until today just skipping one day lol. Today I am having some severely uncomfortable pinching/cramping on my left lower side. Kind of like a cramp but more direct. Could this be implantation cramping it's driving me nuts!!! Anyone has had these symptoms before? I'm scared this means af is coming.