it is highly unlikely it was from the other guy. It takes a minimum of 6 days for an egg to travel down your tubes and implant. Then you need time to build HCG into your system to reach a level high enough to be picked up on an HPT. Most people will not see positives until 10-12 days past ovulation. There are some that see lines earlier but the earliest I've ever seen is 8 days past ovulation. The fact you had a positive 5-6 days after DTD with the other guy means it is EXTREMELY unlikely he is the father because of the timing. Like a pp said though, the only way to know 100% is a DNA test. But i would say you are in the clear and the father is your ex
If your due date is Dec 13 count back to week 2. That is around when you conceived. I believe that puts you mid to end of march. As others have said there is no way to tell for sure only speculate. But you have good reason the believe it's your exes. But no other way to find out other than dna test for sure
It actually makes it more definitive that the father is the ex. If your original due date was the 18th, your conception date is March 23rd to March 31st. Your due date being the 13th puts your conception date as March 18th - March 23rd. Either way, the other guy can't be the father. But if you are still concerned, i would track one of them down after baby is born for a DNA test.
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