well birds don't get pregnant they lay eggs, they are not mammals. usually they lay about 8 or more days after they mate. if they are making a nest and the pair are billing they will lay soon.guyz how can u tell if hen is goin to lay eggs soon or how can u tell if hen is pregnet??
if they are building a nest. usually not long, there is no strict guide lines on mother nature, just wait and they will lay sooner or later, if the loft is crowded and they keep getting disturbed sometimes they will not want to lay, so give them all they need and some peace and quite and they will make a family...and keep going if you do not replace the eggs with dummy eggs, so that is important too, two or three rounds is enough IMO.how long b4 they lay they start takin needles inside the nest