Congratulations on your pregnancy adkmaia. I bf my dd1 throughout my pregnancy with dd2. However dd1 was just over 10m when I fell pregnant, so by the time I realised (after her 1st birthday!!) I had started the process of introducing cow's milk. She didn't drink much of that for a few months, but since she was used to drinking water from a sippy cup (she finally got the hang of that at around 10m, she too had never taken a bottle), and was eating cheese and yogurt etc, I wasn't worried about it. I never thought about increasing my supply. Yes, it did reduce, but my dd1 didn't care! She just carried on nursing regardless, and then when the milk came back in after dd2's birth, she loved it! So, unless your lo is worried about the reduction in milk supply, there is no need to wean her if you don't want to.
However, I'm not sure whether you might need to think about some sort of formula supplementation until 1 yr - hopefully someone else can advise you on this part.