@Sonic85 your FSH looks fine!
At 40/ 41/ 42 the most critical consideration is time, because as you edge into 42/43 the door is closed for the majority (becomes reliant on upper 10% fertility or scratchcard winner luck). Spending multiple months TTC and facing the gauntlet of recurrent loss runs down the clock. If a pregnancy occurs and it's doomed because of chromosomal abnormality, that can take months to resolve.
Trying naturally, someone has 12 chances over a year (unless someone starts double ovulating). IVF cuts to the chase fast (particularly if you test the embryos to locate the normal ones) and could give you a year's worth of chances in one go.
The success rate is higher than TTC naturally. You know for definite whether fertilisation has happened and if problems are identified, they're addressed (eg. sperm injected directly into the egg). You transfer the strongest embryo and ensure endometrial conditions are optimal.
Caveats: If someone has diminished reserve/AMH is low and FSH is high, IVF is not necessarily worth it because the ovarian response may be too minimal. It's also a financial gamble for anyone who is older, as finding a normal embryo (a euploid) can still be impossible. At 40, the % of normal embryos is around 40%. By 43 it's 15%. If you do locate a euploid, you reset time and your chances rocket.
I got pregnant at 42 after 4 months of TTC for the first time. After it ended in loss I looked at the stats and the urgency of the time remaining and went straight to IVF to embryo bank in back to back cycles despite no big history of problems.
An interesting thing about IVF is seeing all of the development stages/ possible failure points out in the open. Nobody is getting pregnant or not because of seeds or juice or putting their legs up. The progesterone fixation is misguided and sperm regularly meets egg.
This is some of what is happening under the bonnet:
- The egg needs to be fully mature and high enough quality to be fertilised normally
- The sperm needs to be able to penetrate the egg's shell. Some men have low levels of the enzyme required.
- Both the egg and the sperm need to be high enough quality for the resulting embryo to be able to develop as far as blastocyst stage, which requires major cell energy (this happens 5 or 6 days after fertilisation - if the embryo is too slow to develop it could miss the implantation window)
- Over half of embryos are incapable of reaching the blastocyst stage and arrest or disinitegrate. Someone TTC naturally would see a negative and have no idea this is what has happened. Or they reach blastocyst at a grade which is too poor to implant/ becomes a chemical.
- Most critically, the embryo needs to have the correct number of chromosomes. Even 30 year olds have almost half abnormal eggs. This is the main reason it can take even young people months to get pregnant and why there are so many early losses - nothing to do with insufficient progesterone or sexual position.
- If the embryo was normal, loss after an established pregnancy can still happen if sperm DNA fragmentation was high
Suggest the following and then deciding how to proceed
- AMH blood test
- A scan to check your follicle count and make sure your uterus looks fine
- Semen analysis
Whichever path you take, also suggest your partner cutting alcohol and taking antioxidant supplements if not already. Older eggs can't correct imperfect sperm in the way younger eggs can.
Ar 40 you still have it all to play for. Good luck!