Realistically, yes, I guess it is more likely but there is no real way to know as it is entirely possible that the first guy could have been the one to do it. You will need to wait until the baby is born and get a test done to be sure.
This just shows you something... two things really... You shouldn't be having sex if you're not ready to have a baby and you should be careful who you're having sex with... if you don't want them to potentially be the father of your baby, you shouldn't be messing around with them.
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