Not knowing/not being signposted is almost never considered a valid reason because despite the usefulness of AAs, the onus is always on the student to know this stuff and/or find it out.
At my institution, pregnancy by itself is not sufficient for mitigation, though the anaemia might be if you link it to actual symptoms and can provide medical evidence to this end. Applying for it retrospectively, post-result, would likely not change much at my institution.