September 03, 2021 23:43 Updated Follow None of the issues with the Johnson & Johnson vaccine developed longer than three weeks after the vaccine was received. Related articles I got the Johnson & Johnson (Janssen) vaccine within the past few weeks. Should I be worried? Do any of the COVID-19 vaccines have an effect on menstruation? If I’ve had a bad reaction to Comirnaty (Pfizer) or Moderna first dose, can I get a Johnson & Johnson (Janssen) vaccine? Can I be required to get vaccinated? Is the Johnson & Johnson vaccine safe?