I just found out yesterday I am pregnant. I had sex on days 9 and 11. I then had sex with a different partner on days 15 and 16. I know this may be impossible but I am trying to see if there is a way to tell when I got pregnant. Who this baby's father is will determine what I want to do about the situation.

There is no way to tell for 100% certainty that I know of until the baby is born and a paternity test is done.
4 different guys within one week it could be any one of them.
If they had been further apart like a month span it would be a bit easier to narrow it down a bit.
If your gynie can give you an exact due date you might be able to figure out who it more likely might be.

The only way to be sure is to get each potential father DNA tested. You can get a court order, as a prelude to taking action for child support once the father is determined. Understand of course that you'll be opening quite a can of worms with many emotional and legal repercussions.

Unfortunately there is no way to know until the baby is born and a DNA test is done. We can give an educated guess according to your LMP, but that is NOT proof.

I just posted a question but I don't think I worded it correctly. There were only 2 partners for the month, those were the dates I was with both of them. If that makes any difference.

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Please keep your questions and answers in the same place. Starting new threads only causes confusion.

It makes no difference whether you were with 2 or 4 men. You will still have to wait until the baby is born for a DNA test.