if i had sex with someone who is two months pregnant can the baby have my DNA too?
The baby will not have your DNA, that is medically impossible, as if she is already pregnant then the baby is already crated with half of her DNA and half of the father's DNA.
No the baby will not have your DNA, The baby will have the biological fathers DNA. Hope that clears things up.
If it did, you would be famous in all the medical journals