In a horrible lapse of judgement very early in my relationship with DP, I slept with my ex. DP knows and everything was fine, as it was so early. Based on emails sent at the time, I know that at least 3 months passed, but possibly more, between that and me becoming pregnant. The date of conception, confirmed by all my scans and the birth lines up perfectly with one very "active" week, in which DP and I experienced a contraceptive malfunction.
Child is now much older, though I would rather not give too many details. Ex contacted me out of the blue to ask whether there was a chance child is his. I said no, he accused me of lying or at least not knowing for definite. I sent him the email evidence, and haven't heard from him since, though I've been convinced it's not the last I will hear of it.
I was contacted last week by his mum, who has occasionally messaged me since the break up. After a little chat, she mentioned that ex's wife (and mother of his child) is under the impression "he might already have a child with me". His mother things he is using this against his new wife to mess with her mind and says she knows I wouldn't lie about paternity. Nonetheless I explained the situation for clarification and she quickly changed the subject.
It is making me ill too think of ex letting his family and friends and his poorwife think he has child which he knows isn't his. I'm also completely anxious that he will get in touch again, having decided the current evidence isn't enough.
DP said he didn't feel the need to get a paternity test as he fully trusts there's no way. However when ex's mum got in touch, he said maybe we should do we can prove it to them and move on.
I'm devastated we have to pay with anxiety and money for a test neither of us feel is necessary and even though I have nothing to hide, I'm terrified. We decided we would get a test on pay day, and that day is today...
Dp has decided we shouldn't bother but I know I won't be able to put this behind me until I know there's no way anyone can question it again. I also want to make sure his wife is under no illusion about the possibility.
Has anyone experienced similar that can offer any advice or support? I really hate this situation and due to the nature of the problem, can't really talk to anyone but DP about it.