Chicken pox exposure

My mother in law has shingles, I contacted my OB and was told to stay away from her until it passed, no problem. Apparently (I had no knowledge of this) my brother in law has been assisting her in applying the cream and she has been walking around the house, scratching her back on the wall corners, etc. I was with my brother in law the weekend she tested as well as this past Friday and Saturday. My brother in law informed my husband and I that he was having allergy symptoms, a stuffy nose, itchy eyes, sore throat, so on and so forth. We weren’t too concerned considering the fact that the area we live in is awful with allergies this year. My husband and many other friends and family members have been fighting the same symptoms for weeks due to allergies. Like I said, I was with my brother in law this past weekend and on Sunday he started showing signs of chicken pox. Nobody informed my husband or myself until it was confirmed yesterday that he definitely has the chicken pox and the “allergy symptoms” he was experiencing was actually the “flu like symptoms” that occur 1-2 days before the spots appear. I have called my OB office 4 times since last night and nobody has called me back yet. I’m 32 weeks pregnant, and already high risk due to other health issues. I should also mention at the beginning of my pregnancy when I had gotten bloodwork done, they informed me I wasn’t immune to the chicken pox and the vaccine was no longer in my system. Any advice on what my next steps should be? Thank you.