Hi, I'm new to the forum, so I apologize in advance for not knowing all of the abbreviations everyone uses

So for a bit of an introduction...
I'm 27, have been WTT since I was 20 and have been very unlucky in love (and a very late bloomer), but finally found my first long term partner just over three years ago. I have been wanting to TTC since our first year together. We had a scare (even though I was on the implant) and I was secretly devastated when the test was negative. Now, I am more ready than ever - and even starting to feel a little obsessive, lol.
My partner is 30, is high up in the career ladder, says he has these big plans to retire young and doesn't want kids still living in the house when he is 50. Soon after we bought our house, he said he wants to have kids with me, but when I talk about trying, he changes the subject. I've been trying my hardest to show I am ready by fixing my finances, getting promoted at work, being depression free for 12 months now, improving my health and fitness, helping around the house more, etc. I ask him why he isn't ready, and it's always the same - finances. Yet he's got enough to purchase a second investment property on his own...
I needed to show him how serious I am about being ready, so I've booked in a pre-pregnancy checkup with my doctor for next week and talk about possible removal of my implant soon. That had him a bit speechless. I explained that if I have any reproductive issues, I want to know now when I can fix things than in the future when I'm too old to.
I'm trying my hardest to show that I am serious (without mentioning it every other day) and I'm starting to think the only way he'll be ready is when it actually happens. A couple of friends joked about removing my implant with out telling him, but I could never do that, lol.
What should my next step be in showing him that I am ready and I believe he is too, without turning him off the idea completely?
(Sorry about the length, this has been dwelling for a long time)