Accidentally ate bread that turned out to be moldy. do i need to do anything, or is my body able to deal with the mold no problem?

Most likely: Most likely should be ok your body likely digested it. Most moldy bread is benign and you wont have any symptoms however few can cause illness. If you start developing cold fever like symptoms then you may want to present to your doctor. Most likely you are fine though. At most you might develop vomiting, diarrhea, upset stomach but this will go away after few days, hydrate. If not go to doctor.

Probably ok: Likely, you will have no ill affects. As penicillin comes from mold, however, if you have a penicillin allergy, keep an eye out for any allergy symptoms, and consider antihistamines.