Implantation bleeding?

Hi all! My DH and I have been talking about trying for another next month, and last Friday we had sex without a condom and he didn't pull out. It was day 1 of my fertile days and now 7 days later I am having light spotting. My period was never like this before I had my daughter 11 months ago, but I just got off Mirena 3 months ago and this is my second period. First was medium to heavy for my normal 7 days, and second was 3 days of medium spotting. Now light bleeding 2 days after ovulation? I was a little crampy the next day after sex, and now I'm wondering if this is implantation bleeding or not possibly that.

Thanks for any input!