the beleivers resort to desperate measures to try and inpregnate tasha after she fails to fall for jonahs charms. Mumma rose (head of the beleivers) slips the date rape drug into tashas drink and jonah gives it to her. he then rapes her and she has no recolection of what happened, the next day when feeling a bit ill (effects from the drug) tasha puts it down to food poisioning.
There has been no confirmation whether she is actually pregnant yet.
Incase people want to know why they want tasha to have jonahs baby they beleive she is will carry the earth child or something like that.