Would that be it?

Hi everyone, my partner and I are trying to conceive, so I stopped taking the pill about 2 months ago. I got my period on May 16th. My cycle is a bit irregular now because I started the pill late and before that I had a 28-day cycle. So I calculated my fertile days based on these days, but also for 30 days. During that period we had intercourse. Last week I got painful stabbing pains on the right side of my lower abdomen, all day long. In the evening it became less severe. The next day the pain moved to the middle of my belly, but it wasn't too bad since I could handle it. This lasted max 2 hours. I should get my period this week (though I hope not). Could it be? I've been feeling tired and dizzy lately, and since yesterday and today I've had some cramps. I don't have any issues with my breasts, but I sometimes feel a bit nauseous where I sometimes gag... Now I just don't know if it's my period coming or if it's from that? I also wonder if it was ovulation or implantation that I felt? But I've never had this kind of pain before. What do you think? I know it might be a bit early since I stopped the pill 2 months ago, but could it be? I'll just let it play out but I'm curious anyway. Thanks in advance for your answers! Best, Eva