I had my last period on March 28th. I had intercourse on April 27th with my lover.

I had no menstruation in April, then, in May, I had protected sex with my husband. I had no period in June with a negative pregnancy test result.

I received a positive test result in July, with the day of conception June 2nd.

Who do you think is the father of my baby; the lover or my husband?

The ONLY way to find out is a DNA test AFTER the birth anything else is simply conjecture.