No, it is not. Women can continue with their sex life despite being pregnant. In fact, some are able to experience ejaculation for the first time during pregnancy as a consequence of undo pressure on the pelvic regions.
Iván Ferrer Durbà
Bachelor's Degree in Biology by the University of Valencia (UV). Postgraduate Course in Secondary Education and Teaching by the University of Portsmouth. Teacher of Sciences at multiple British schools and high schools.