Hi mamainlove
I'm not sure what I can offer in the way of help but wanted to post as our experiences seem really similar.
I am now 21 weeks pregnant and I have DD aged 19 months.
When I first got pregnant, she was feeding four times a day - once at 5 or 6am (then thankfully back to sleep), mid morning at 10am, 2pm before nap and then bedtime. The 10am feed dropped itself really as we were out and about at toddler groups etc and I offered her a snack instead.
Although my doctors and midwife were very supportive of me continuing to feed DD I was conscious that I had a hard time when in labour with her (she was prem and I was in hospital in total for almost a fortnight), and I wanted to reduce feeds so that she wouldn't miss me too much if I had to be away for a similar time with this baby.
So I dropped the 2pm feed. Which was a bit of a nightmare as it was how she got to sleep for her nap. But I just pushed her in her pushchair and we got to the stage where I could push her for ten mins or so, then come home and park her in a room with the door shut and leave her to sleep for up to two hours. Could you try this?
She somehow started sleeping through longer and gradually dropped the 5/6am feed and I started giving her a cup of milk first thing in the morning (she also gets a cup of milk mid afternoon).
We held onto the bedtime feed for a long time. It was often painful. I think my milk went when I was about 15,16 weeks pregnant and she seemed happy to dry nurse but would often make lots of scratching, tweaking gestures at me which I think are related to the baby trying to increase the milk flow. I took the decision to stick with our bedtime feed until she wanted to drop it, even if that meant tandem feeding with next baby. Other people can settle her without a breastfeed at night, it was just that when it was me she wanted to feed. But, the past three nights she hasn't wanted a feed and has just cuddled into me and gone to sleep. So I think my lack of supply has finally encouraged her to wean.
I think (purely anecdotally from things I have heard from other people), that older babies are more likely to wean when the supply goes than younger ones, so my own (very uninformed and personal!) opinion is that your DD would be quite likely to wean herself at some point in your pregnancy anyway.
Sorry this is an epic post. But I just wanted to share that you are not alone, a lot of people are in this position. If you can bear to keep up the feeds and gradually reduce it, it might be that you can get down to just the bedtime feed like I did, and then your DD will drop that herself once there isn't any milk...
I know its tough though. I feel so sad that my BFing relationship with DD seems to be over, but she had such a tough start and I am really proud that I managed to feed her this long. Try to hold on to that, what a great job you have done to feed thusfar.