I'm sorry to hear you're having a tough time.
I had a tfmr at 22 weeks in January. We opted to see our dd2 but it took my dh a while to decide (I said I'd see her on my own if he didn't want to)
However, I remember that reaction of wanting it all over. I had my termination injection the day after we got our results and dd2 was born 2 days later (although, obviously shed died already)
I was just thinking today I wish I'd not had it done so soon and spent a few days enjoying my pregnancy with her. I was so scared and I just wanted it done.
Many of the decisions we make at these times are made in fear and because we're scared. We may regret them later (I know I do) but we must be kind to ourselves and try to remember the huge turmoil we were in when those decisions were made.
Your dd will have known your love, for those 15 weeks that is all she knew. This is one of the reasons we decided on a tfmr, I wanted my dd to have only known my love, not the plan and suffering her condition would have brought.
Have you had any contact with arc? They're brilliant for chatting through these awful feelings.
Please try to be kind to yourself