Hi Im Almost 19 Weeks Pregnant And Worried My Husband

Hi im almost 19 weeks pregnant and worried my husband my not be the dad. But the only other man i was with was 4 days after my husband acadently ejaculated inside and there was no penetration if any it was just a little. Im worried about precum and i was at peak ovulation only one day before the other man. Should i worry about the other man being the father?