Covid 19 related. On further steps.

Dear doctors, Kindly guide what to do in the below scenario. Day 0 - husband arrives from other state to his home Day 1 - husband comes to visit me (6months pregnant) and my family (parents over 70yrs with comorbidities,  child 5yrs old) and stay over at night at my house. His mother starts showing symptoms (fever and diarrhoea) in evening. Informs him over phone call. Day 2 - RTPCR done for both my husband and his mother after he returns home in morning. Day 3 - late evening husband's result Negative but mother is Positive. Mother is on medications and isolation. Kindly suggest if we need to test ourselves. We have been exposed to my husband , who has been exposed to covid 19 for 36hrs almost, before coming in contact with us. His reports are Negative. PS. Me, husband and child have had covid last September. However, my husband antibody test report came negative while mine came positive in January. Please suggest and guide on further steps.