a little bit confused

Hi po! Ask lang . Meron kasi akong bp elevation history twice. pero normal yung laboratories ko . kaya yung internal medicine doctor ko hindi muna ako binigyan ng maintenance. pero now , i am 20 weeks pregnant. and my OB prescribed me nifedipine and aspirin para daw sa bp elevation ko and to avoid preeclampsia. question, safe naman po diba yung mga nireseta sakin, and no side effects? maraming salamat po!