I'm really confused :( I had sex with guy 1 once on August 15th, I then had my period 18th August.
I then had sex with guy 2 starting from the 29th of August onwards, now I am 20 weeks and 2days pregnant, with a due date of may 24th, conception calendars have said with a due date of may 24th conception was likely to be around September 1st.
And the conception calendars say if conception was August 15th then I would be 23 weeks and 4 days pregnant with a due date of 8th of may? I'm really confused! Loads of people have said its guy 2, but then a few have said it is guy 1? Please can someone help me out! I really hope it is guy 2!

You will have to have a DNA test done after the baby is born to determine paternity.

You will have to have a DNA test done after the baby is born to determine paternity. but what are the chances that guy 1 is the dad, and chances are guy 2 is the dad

Without having a camera in your fallopian tube (it has been done) to know when you ovulated, there is no way to give you a percentage of any kind.

Since there are two guys, the chance is 50/50. If there was three guys it would be a 33 percent chance.

That is if you had sex just once with each.
If you had sex with guy two 9 times and guy one, once, then it would be 10 percent chance in basis.

There is no real way to tell. And it is too close to each other, you will just have to do a DNA test