Honestly? Sounds to me like you wanted to get pregnant, he didn't and you found a way to do so without the true consent of your partner, probably expecting he'd just go along with it once you conceived.
That said he's a grown arse adult perfectly capable of taking full responsibility for his own fertility. Have you proof of his fertility issues outside of his saying so? Not only dishonesty but he may have misunderstood something he was told, or even have the info 3rd hand. I know a guy who was told by his mother he was infertile as a result of mumps - but he wasn't she had assumed he would be but no tests had been done but the way she'd put it across to him he thought there had been!
Now you're stuck cos he sees abortion as a perfectly reasonable response to what he believes is an unplanned pregnancy.
I don't think you want an abortion and are actually hoping one of the responses will give you a way to persuade him to accept and go along with the pregnancy.
All in all irresponsible, immature behaviour from both of you.
Only you know if you want this child or not. Only you know if your partner is likely to accept the pregnancy, stay with you and be a fully involved father or decide nope this was an unplanned pregnancy I'm not ready to be a dad and leave.
"just to clarify Natural Cycles is contraception. It tells you when you are and aren't fertile." It's really not and I question your intellect if at 31 you really think such methods are reliable contraception. You need to educate yourself PROPERLY on how conception, contraception and female cycles work. An app can't test blood or urine or take temperatures it is entirely dependent on the user entering accurate data to assess the risk.
Ultimately in the vast majority of cases unplanned and planned pregnancies the mother is the one who's life changes the most and has the most responsibility for the child. So that's the viewpoint you need to come at this from. Are you ready to be a mother with or without a father involved?
"I’ve heard of a lot of people getting pregnant with these apps, they’re not v reliable." It's not the apps it's the "contraceptive" method - which isn't! People's cycles vary too much, both from person to person and month to month in same person, then there's the fact that fertilisation can occur up to 5 days after having sex! I'd think these methods/apps far more applicable to people ttc.
You believed salesmen and ads rather than medical professionals.
"being sold as" key phrase. They don't care about the people using them their focus is on sales and advertising revenue.
"FFS mummy there are no ‘innocent lives’ involved, there is a cluster of cells which is not a sentient being" I'm pro choice generally, anti abortion personally (as in I wouldn't have one) but it's wrong to dismiss other people's opinions.
But I also agree every child should be wanted I'm the result of an unplanned pregnancy and I've never had a good relationship with my mother and honestly believe she blames me for "trapping" her with my dad - at least initially.