6 days past ovulation

Me and my husband are both twenty years old and we have been trying to conceive since August 08. I have never been on any kind of birth control and have never been pregnant. My husband is the only person that I have ever had sex with. Well my last period...

started on Oct. 1 and ended on the 5th. This month we had sex on the 5th, 6th and the 7th and 10th, 11th, 13th, 14th, 15th, 18th, 19th, 21st. My next period is expected on the 1st of November. I believe I ovulated on the 16th if so it has been 6 days past ovulation and since yesterday I have been feeling different like if I was getting a cold and have been getting small headaches but I also have been getting cramps and I never get cramps. so is it possible to start feeling pregnancy symtoms this early?

You start getting cramps within 5 days, this is the egg attaching to the inside of the uterus. Many small symptoms that tend to mistaken as sickness can also be the sign of pregnancy within the first 2 weeks.