Anaemia can't strike in 2 weeks. A period slightly low in iron is very normal for a pregnant woman, the fetus gets what it wants. And also it won't give her lifelong bowel problems!
Its also mostly an invented Western "disease" anyway. And excess iron is incredibly toxic.
20 years ago the blood donor folks stopped me from giving blood unless I took iron tablets. What a load of rubbish! Sadly for them, I had to tell them where to put that advice, and have unfortunately not given blood since.

