I fed through pg with ds and then tandem fed for almost 8 weeks (had other issues which made me wean dd).

Feeding does not impact your pregnancy, but be sure to eat well and sleep when your toddler sleeps because your body is doing some amazing stuff.

Colustrum arrived just before birth but I had a significant supply drop at 16 weeks pg. dd still fed but she naturally increased her food supply. Yes watch the toddler poo though. Colustrum plus potty training was hideous.

feeding is great to bring on labour when you're starting to contract and to help early engorgement with the next baby.

Enjoy this special time.