Hello
Thanks for posting your query at DoctorSpring.com
Dont worry .
Relax.
Listeria and other bacteria mostly thrive when leftovers are not properly heated to atleast 165 degrees, and when they have not been properly stored in the refrigerator.
So yes, this was a lapse.
But it was a one time thing.
I do not thing the chances of acquiring any infection from this episode are great.
You can safely choose to ignore it, particularly if you remain symptom free.
But yes, you should be very careful in future.
Use a food thermometer while reheating your food.
Ensure fridge temperatures are optimum, by using a refrigerator thermometer.
Stop worrying about this event, you would not acquire anything by just one episode.
Also, the food was home made and thoroughly cooked.
Wish you a great pregnancy !
All the best
Please feel free to discuss further.