What to do?...

Me and my partner have a nearly 3 year old daughter. I had her when I was only 19 and fell pregnant in the last year of college. I have not been able to focus on a career or job as we live far away from family and she only goes to nursery for 5 hours on a Monday and Friday. I’m at the stage where I am ready for baby number 2 because I want another one and I don’t want there to be a massive age gap. We are financially stable on my partners income but if I have another one I then can’t work or start a career for another 3-4 years. I don’t want to start and stop a career but I’d be 26 before ever having a proper job and no experience. I also don’t feel like its right to put that kind of pressure on my partner? Any advice?