Were they implying Jackie has had an abortion?
During the doctor's visit in the most recent episode, Jackie was helping Becky fill out her medical forms and they had this interaction:
Jackie: "Uh, terminated pregnancies?"
Becky: "Zero."
Jackie: "Oh come on!"
Becky: "Aunt Jackie!"
Jackie: "I just know that you were popular like I was, so I assumed."
It really sounds like, with Jackie comparing herself and her promiscuity to Becky's and being shocked Becky didn't get an abortion that it was implied that maybe Jackie had gotten one.