Is doggy style good for conceiving?

Yes, you can get pregnant from doggie style This was the normal way of doing sex at one time. The human race would have died out if it didn't work.
Yes, regardless of sexual position. If intercourse is had which includes actually inserting the penis into the vagina, you can get pregnant. EVEN IF he does not have an orgasm, precum is all that is required for you to get pregnant. ( use condoms and it is no big deal ) . If you wish to have sex without risk of pregnancy, try oral or hand jobs. :)