ttc.I had unprotected sex on the 1st and 3rd the time I would be most fertile would of been on the 5-6. I looked up my ovulation calender and the implantation day way the 10th, but I felt cramping on the 9th,10th,and the 11th (today) I've been very tired the past day or so I took several naps. my period is not due till the 19th this month. I have had a little nausa but I don't know if that is because I am just getting over from being sick. Could I be pregnant or is it side affects of my cold?