Monarch, starts happy, but i got a problem..

Hi, i was super happy when i saw my monarchs mating, the day after it, they did it again..

But now, 4 days later, no eggs are laid.

Information:

Unheated greenhouse, in greenhouse, asclepias sureaca and asclepias with orange flowers from the flower shop, even with a lot of sun, and temps above 30 degrees she lays no eggs, what is the problem???

Grt