Yes, I know, but we have no idea if that's true.
If he really gave her enough to induce a miscarriage, I think she would have felt a lot more than just itchy and sick. The effects from painkillers are not the same as the natural effects from feeling sick. It would be hard to believe that she wouldn't recognize the symptoms of being drugged. The euphoria alone would be the biggest clue. Even if given 3 or 4 times the starting dose, she probably wouldn't have even be able to text, she would be passed out.
I think Shannan was intelligent and responsible enough to go straight to the ER or her doctor even if she suspected she was drugged. Imo