Any medication should be taken after consulting a doctor during pregnancy specially.
These are some medications which are not given in pregnancy:
1) Vit A / Retinols (like accutane, etc)
2) Anti Rheumatic drugs like leflunomide, etc.
3) Certain heart and BP medicines like ARBs, ACEI, diuretics (Lisinopril, telmisartan, torsemide)
4) Certain antibiotics (Fluoroquinolones, tetracyclines, metronidazole, 1st trimester etc)
5) Certain anti-inflammatory drugs like ibuprofen, diclofenac etc.
6) Anti-metabolites like Methotrexate
7) Warfarin