Hi, I am wondering if I could be pregnant. I had sex on my ovulation day without realizing it. That was this past Saturday. I thought nothing of it afterward. Yesterday all day and this morning, I experienced lower back pain along with cramps that felt like I was going to get my period, but I am not supposed to get my period for another 2 weeks. My appetite has been abnormally suppressed, I have had a dull headache, and am somewhat dizzy/lightheaded. Something is up!