Fearing a data dragnet weaponized against women seeking abortions and those helping them, privacy groups are warning that pregnancy-related information online might present a serious legal risk and demanding tech companies take action in the wake of America’s revocation of abortion rights. As states move to ban or restrict the procedure after the Supreme Court’s landmark reversal, worries grew that social media posts or information on apps could be used by authorities to build cases. For example, geolocation data or an internet search history might serve to incriminate women or those who help …