the moment she found out she was pregnant and she drugged him BEFORE he even knew she was knocked up with his kid. I remember being really bothered because she did that to him when they were friends.
Maybe I am misremembering but I truly don't think he even knew she was pregnant when the laundry basket thing happened. It was a pre-emptive strike. And I also recall Carly standing there, watching AJ cry over breaking his sobriety and she knew he hadn't. That's cold-blooded gaslighting.
ETA: Found this....
In 1997, A.J. has a drunken one-night stand with Carly Spencer, who is involved with Tony Jones. When Carly learns she is pregnant, she is unsure which man is the father, but goes to great lengths to keep A.J. from becoming suspicious. A.J. has stopped drinking and is attempting to straighten out his life, but Carly drugs him, fits him into a laundry cart, dumps him in a back alley behind a bar and pours alcohol all over him. She wants him to think he's been drinking so he will go to a rehabilitation facility out of state, as she does not want him around when the baby is born. Her efforts backfire, and A.J. becomes suspicious. He demands a DNA test and tells Carly he wants custody of the baby if it's his. Carly persuades Jason Morgan, A.J.'s brother another of her ex-lovers, to assume paternity of the baby. When Michael Alan Morgan is born, A.J. misunderstands a doctor's explanation about the baby's blood type and mistakenly believes Michael could not be his.