No problem. It depends on the cause of the hair growth but if it's genetic (you're always hairier than others) and not due to a hormone producing tumor, then no problem. If you are already pregnant, then you don't have the tumor mentioned above, so again, no problem giving birth.
NO. Amount of hair anywhere on the body will have not effect on birthing a baby. This may require some shaving to promote a better effect (rare). Interesting question but categorically no.
Unlikely. Any really bad disorder (like testosterone producing cancers) that can cause excess hair is likely to preclude pregnancy...Milder disorders like pcos makes it difficult to get pregnant and u'd need to pay attn to gestational diabetes and excessive weight gain...Most common cause of hairiness is genetics, which doesn't impact pregnancy.