My boss is treating my poorly because I’m pregnant

Ever since I told one coworker about my pregnancy she told everyone and word got back around to my boss. She’s been a major ass hole and has started telling people at work how she’s been trying to get pregnant again for 7 years. So I honestly feel like that’s the reason she’s had a sudden change And has started being overly rude to me. I’ve tried talking to her head boss and he won’t listen so my next step is going to HR. I just feel like problems outside of work shouldn’t be brought to work because now she’s targeting me and creating a hostile work environment. Should I go to HR or let it blow over?