My iron levels keep falling low despite taking iron supplements since having baby 7 months ago. not breast feeding anymore, eat healthy and trying to exercise but makes me feel so tired. i'm bruising easily and have dark circles under eyes which is unusua

Yes: Probably not that unusual but not normal. If your iron keeps dropping, that would indicate you are losing it somewhere, meaning bleeding. So a source of blood loss should be investigated. Also, taking vitamin c with the iron supplement and taking the iron on an empty stomach helps it get absorbed better. If your just can't build up with oral iron, you might need to get the iron intravenously.

More tests needed: Your physician needs to do a hemoglobin electophoresis to look for other problems.

Anemia: Your description sounds like you have anemia. You need to be worked up to determine the cause. I would recommend seeing your doctor.