False positives are extremely rare. I would think its unlikely if you got more than one. Especially from different batches.

The doctor at the hospital tried to tell me I was never pregnant. 2 positives from 2 different batches 4 days apart is very very unlikely imo. Not to mentiom all my symptoms.
Dont let them invalidate your experience if it doesnt suit you. (It really hurt me to be told my miracle never existed.) If you believe in your heart you were pregnant then you were. Pregnancy is so much more than physical. It is hopes, dreams, promises, love. No disbelieving doctor can take that away from you.

Of course if you think they may be right, then that is fine too. Whatever you believe is what matters.

I hope you can have a talk with your DH and come to an agreement.