Could I be pregnant?

I have had some weird symptoms the last two days. I have no idea when I ovulated since I got my iud out two cycles ago but I think we had sex during my most fertile time. I have been feeling waves of nausea, really bloated/gassy, a full feeling in my uterus and pain near my groin. I have also had cramping the last few days. If I ovulated it was in the last 7 days. I feel like I am really intoned with my body and when something changes I notice it. I dont get symptoms of PMS until a couple days before my period which is usually only cramping, so this is all very strange for me. I also got super lightheaded during sex a couple days ago which has never happened to me before.