When Rick walks up to Lori to confront her about the pregnancy, he is carrying the wrappers for the morning after pills in his left hand. When he stops and holds them up in the closeup, they are in his right hand.
When Andrea and Shane exit the car to go and search for Sophia, she loads an empty magazine into her Beretta pistol.
When Glen and Maggie go to get medical supplies, when Maggie gets attacked, the camera pans onto Glen showing his reaction and you can see someone in the background standing next to their horse/car. This person is definitely not a "Walker"
When Glenn and Maggie go to the pharmacy to get Loris abortion pills when the Walker attacks Maggie and Glenn moves to help her if you look out the front window there is a grey haired Man/Woman stood tending to the horses.
The Morning After Pill is only good for up to 3 days after unprotected sex. It would not do anything weeks after when already pregnant.