Pumping/breastfeeding and pregnant again

So my son is 9 months old and I just found out that I am pregnant again! (😮🤗) I am currently pumping and giving my son breastmilk in bottles but I am worried about what pregnancy might do to my milk supply. I was (am) hoping to give my son breastmilk up until 12 months but from some of the things I’ve read, I feel like I may not make it? 😔 I wasn’t exactly sure where to post this.. Has anyone else been in a similar situation? I go to the doctor on Friday to confirm my pregnancy and I will ask my questions then, but I also wanted to hear from anyone’s experience. Thanks!