Do you know when your predicted ovulation day is or how many days your cycle is? For example is it 28 days usually give or take a day?
If it was the average 28 days and you ovulate on the average CD14 then…
3rd would be CD8
11th would be CD16
So the 3rd would be 7 days before ovulation
11th would be 2 days after
I would assume from those dates you didn’t ovulate on CD14 as the 3rd is likely too early and the 11th although possible probably too late.
So without knowing the day you ovulated it really is too hard to know.
Because say you ovulated early around CD10 which some people do then it’s going to be the 3rd.
If you ovulated later after CD14 it’s going to be the 11th.
Do you know when you’re next period was supposed to be due?
I think unfortunately you are going to have to wait and take a paternity test or wait until your scan and the doctors may be able to give you a better idea of a conception date then.
Good luck 