So when was Jessie conceived?

I watched the episode “Undercover Mother” the other day and I just realized that the only time Amanda and Declan were alone was when they were in the interrogation room for a few minutes. After that Declan was shipped off to Rikers for a week for a gun charge. I know Kelli was pregnant in real life and, unless the writers wanted to go the immaculate conception route, they had to name someone as the father, but I just wanted to share