I have no regrets at all. I started the journey at age 35, and needed many goes at IUI and IVF before I got lucky. By the time I had DS1 I was nearly 38, and 41 when I had DS2. So I'm glad I didn't leave it any longer.
My story is slightly different in that's had met, so I thought, Mr Right - but after a couple of years together he announced he didn't want kids. I knew I wasn't in the right mind-set to meet someone new as I was devastated at his revelation, and also knew I didn't have time to recover and start the dating game again. But I knew with absolute conviction that I wanted children. Despite having a good career and lots of friends, my life would have been empty and incomplete without kids.
As I say, it turns out my fertility was already reduced at age 35, so if I'd left it to chance and finding a man, it's highly likely I'd have remained childless.
Fertility treatment has cost me a fortune, but being a single parent has been completely manageable for me, and my boys are my world. The response I've had from other people has always been very positive, and people are very kind and helpful if I need anything.
I think you need to go into it with eyes open, aware that it may not work first time, or even at all, and that it will cost a lot. And that having kids on your own is hard work. But as long as you are aware of these things, it's well worth it in my opinion.