cycle buddy af due 9/28

I need someone who's in the same boat as me to help keep me sane!!! I'm 4 dpo right now and I had a super strong positive opk this month and I confirmed with a bbt rise so I definitely know I ovulated! At 3dpo (yesterday) I had really bad cramps for about 30 minutes localized a little more on my right side and I felt real weak and then it was gone? I usually get cramps before af but never this early or that intense. But this seems too early for implantation. I just have a feeling this is our month though. I had an hsg done at he beginning of my cycle and they say you have a better chance of getting pregnant the following few months after this so ahhh I'm going nuts and fingers crossed!!!