@Lightattheendofthetunnel22
Sorry you're going through this Op, and for the miscarriage you'd had some time ago
. It's a tough position to be in, however you do need to decide whether you want to be in control, or allow a relationship to decide for you.
I'm a solo mother by choice, as we're known, and I had my son aged 39 via IVF and a sperm donor. I was divorced aged 36, and spent the following few years OLD. I appreciate our stories are different in that respect, but what I found being in my mid 30s at that point is that a number of men who were happy to date me (they all had had their children much younger), but wouldn't consider having more. Some were upfront about this, others attempted to future fake me by telling me that maybe for a 'right' woman they'd consider it...I found it increasingly frustrating that they knew being a parent is a unique experience, and if a woman is yearning for it, it is unlikely to go away. I did go on to have two relationships with two men who didn't have children, these also didn't work out and after that I decided to take control of the situation. I promised myself that I would I try on my own before it's too late.
You asked about Fertility Tests. As I did my treatment privately, I'm not familiar with what your GP can do. As for private fertility clinics, you can book a consultation with a consultant (for a few £100) and they would discuss your situation, medical history, possible protocol as well as fertility tests. I believe some clinics offer 'Fertility MOTs' where you can just do the specific tests and ovarian reserve scan to get a preliminary idea of your fertility. Conception board on MN has some useful threads about this, as well as Fertility Friends.
My son is here now, and he's lovely. No man is worth giving up this experience for. And I have loved and been in love. I'm late to motherhood and I only wish I'd started earlier. Should your relationship break down in the future, and nobody can say it won't, your partner will always have his children, whereas you will have been robbed of being a parent. Fertility is fickle and nobody can predict in advance whether they will encounter issues or not. Conceive easily or not, and carry pregnancy to term to not. Fertility stats by age group are an indication of what to expect, you may be within them or outside them. And I also agree with others, resentment will eventually seep into your relationship and potentially destroy it.