Oh don't worry too much, mama, half-cooked meat once in a while is not ideal, but one incident is unlikely to cause serious harm, though it's best to be careful from now on since raw or undercooked meat can carry bacteria like listeria or toxoplasma. Do keep an eye on how you feel over the next few days, if you develop fever, body aches, nausea, or any unusual symptoms, do see your doctor straightaway just to be safe and put your mind at ease. For now, make sure all your meat is cooked through properly, and try not to stress yourself too much as stress isn't good for baby either, but do mention this to your doctor at your next checkup if you're worried.