Although spoilers are positive I don't have the inclination to watch just yet. Next Jumma might stretch for a month and also like you pointed out, he might suspect billi and even confirm that it was her plan to break him and zoya as a couple but ultimately it will be zoya who will find out the truth about the pregnancy at the nth moment.
Whatever happens I only wish they stop botching up Asad's character. Every other show has dumb heros who never realize they are being taken for a ride by the vamp, wish Gul ma'am would make Asad different.