Pregnancy risk on mirena with perimenopause?

[Marrongrass]

Wasn't sure whether to post this in relationships or here, but as it's basically a technical question I thought I'd try here.

DP has health anxiety and general anxiety. Yesterday he suddenly got scared I might get pregnant as we've been having sex almost daily for a week (long-distance relationship so taking advantage of a rare week together: I wouldn't normally have the stamina 😆).

But...I have a mirena coil, inserted nearly two years ago, I use daily eostrogel...and...I'm 48!

I'm not getting periods on mirena, though occasionally very light bleeding (the last over three months ago and my gynaecologist said to up my eostrogel to 3 pumps, which I did and it stopped).

DP wants reassurance. I googled lots and personally I have no worries whatsoever, but I couldn't find anything that showed risks of pregnancy with mirena and age combined. I tried remembering GCSE maths enough to come up with a vague estimate of a 0.2 in 10,000 risk, but I have no idea whether that's just random.

Anyone able to reassure/offer a good link/do maths?

If he wants to avoid pregnancy tell him to wear a condom

I'm hoping the risk is so very low that we don't need to. I think it's likely he'll insist on it, though!

I thought the merina was a reliable form of contraception, not necessary to use condoms too surely

My point is that if HE is worried, then HE needs to take ownership of HIS contraception.

Absolutely: my worry is rather that he'll go too far that way, as his anxiety can get ott!

Has he seen his gp to address this extreme anxiety?

Very, very unlikely IMO.

Yes, many, many times, though not about this latest manifestation of it. I suspect any sensible GP would suggest wearing a condom or having a vasectomy if that worried, which is likely to be experienced by DP as a validation of his fears and heighten his anxiety. So I'd rather find some simple links to research showing the risks.