Don't know if I should stop breastfeeding..

Ta

I was planning on nursing for as long as my daughter wanted to.. but shes 7 months and I'm pregnant. It's tolerable, but nipple sensitivity hasn't really made it easy to nurse. Also she's got two teeth now and sometimes she bites (from teething) and it hurts. I know that won't last long, but I'm wondering if it's better to just wean her off now or continue to nurse.. I know its going to be difficult nursing the new baby if I'm still nursing my daughter. I'm stuck. Cost isn't a issue seeing as how I'll have wic to help pay for formula. And my doctor says it doesn't matter either way, so I don't know what to do...