Breastfeeding while pregnant?

Shayla • Married with baby #2 due Jan/Feb and mommy to a rambunctious 2 year old!
I just found out I am pregnant and I am still nursing my 20 month old. She nurses mostly at night and a little during the day. I am debating on weaning her or just going about my business. Hoping to tell hubby this weekend and calling my OB monday