Can you get pregnancy symptoms 6 days after sex?

[Kita123]

me and my boyfriend are trying for a baby, I was ovulating Wednesday 23rd, we did it in the Friday 18th and Monday 21st but we didn’t do it on the highest ovulation day which was the Wednesday.
On the 5th and 6th day I have been getting really bad headaches that last all day, also been feeling a little bit sick. Could this be symptoms or is it too early to tell?

Far too early to tell. Some women have no symptoms at all. My only symptom was a missed period! Good luck!

If you only ovulated on the 23rd, then you are only one day past conception - far far too early for symptoms! Even 6dpo would be a bit early. Give it another couple of weeks.