Two men attacked and robbed a pregnant woman after arguing with her and her husband outside a Hong Kong railway station during Friday’s early hours.The pair made off with a necklace and HK$20,000 (US$2,550) in cash.The 39-year-old woman, a Hong Kong identity card holder of Pakistani origin, and her husband, 42, were arguing with two non-Chinese men when the incident happened on Pitt Street, near Yau Ma Tei MTR station, soon after midnight.“In the midst of the argument, she was slapped in the…