So sorry to hear about your losses, it is so heartbreaking.
I was in your position last year - after 4 miscarriages in a row, DH and I sat down to discuss our options. I was seriously considering donor egg IVF and, even more seriously, adoption, but it turned out that DH wasn't keen on either. Which I found very hard to accept.
I had counselling with an amazing lady who specialises in pregnancy loss/still birth, and those sessions helped me realise that I wasn't 'done', so DH and I decided to start trying again, still hoping for that rainbow baby, in spite of all our previous losses. However, whereas I had always fallen pg within 2-3 months of trying before, it took a lot longer this time, no idea why... So long that I got to the point where I wanted to stop and started to accept the fact that DS (4) would/could be an only child (something I never ever wanted) - I was so fed up with it all, the stress, anxiety, I wanted to start focussing on the good things in life again and move on and be happy.
Which is when I fell pg, I'm now 31 weeks, all looking really good so far.
This has not been an easy pregnancy. I'm well looked after, due to my history, but the anxiety has only recently become negligible (the first 2 trimesters were brutal), and I am well aware that I am not out of the woods yet - 2 of my 4 mcs were due to chromosomal abnormalities, one of them was a 2nd trimester loss, and while nothing has come up so far yet, there is no guarantee that all will be fine...
It is a very difficult decision when to draw a line under ttc and to move on, only you can decide that. From my experience, it is not something that can be done in the spur of a moment, it is a long, drawn-out process, with lots of setbacks, doubts and fretting. Give yourself time and don't put any pressure on yourself.
I found that taking active breaks from ttc always helped me to re-focus and figure out where I stood, even if it was only a couple of months. Like others have said, you have been through so much.
Take a step back from it all, focus on your DD and live life and see how it goes. Maybe set yourself a 'date' when you sit down again and re-evaluate how you (and your DH) feel. Wishing you good luck!