N o form of antihypertensives or nay other antibiotic drug should be taken during the first trimester as it may cause congenital anomalies. If you are already hypertensive, then you must control your blood pressure first and be asymptomatic for 3-6 months before contemplating pregnancy, as pregnancy would further increase your bp and subject you to serious complications in later pregnancy. Nifedipine can b used late in 3rd trimester but not in first for sure.
I hope i have answered your query,
wishing you good health,
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