I need help

I’ve been off the pill for almost a month. I’ve already had a menstrual cycle, I also spoke with my gyn on how soon I would become pregnant. She advised me that of course it’s different for everyone, but in my case i was fertile as soon as I got off my pill. My husband and I have been sexually active for about two weeks. Yesterday and today I’ve been experiencing a lot of pelvic cramping mostly left side. I don’t really notice bloating and constipation.. so I bought the ovulation predictor kit and it said I’m not ovulating. So I took a UPT test just to check and it was negative.. all night I didn’t sleep very well. I was laying on my left side to help with the cramps, but then the right side started hurting... could it be plantation?? Or is it to soon ???