Undercooked pork

I'm freaking out a little bit. My husband made smothered pork chops for dinner. After I had gotten about halfway through I realized it was a little chewy!! At my 5 week apt the OB told me to stay away from lunch meat in case it's not thoroughly cooked. Ah! What are the risks of eating undercooked pork while pregnant? Will one exposure harm the baby? I'm 5 weeks 4 days along.