Question: HIV and AIDS?

Had my hiv test done after after 5 months of possible exposure it was – so was my partner,fell pregnant a month later,went for prenatal classes on my 7th month it was+.I was given ART I didn’t take it, I had my son 7weeks ago he’s- but I still tested +,Read that pregnancy can cause false+,HIV specialist confirmed it that it can happen. Should I be worried?