I wouldn't worry, one thing I learned from genealogy research was that despite our parents moralising us against sex before marriage, it was almost the norm in ancestry research that the first born arrived around six weeks after the wedding. I also discovered a great great grandfather who was born illegitimate, married his second wife just a few weeks after his first wife died and his best man or witness at his second wedding was the second wife's brother who had also registered the death of the first wife. The said great great grandfather later committed suicide by hanging. I also have my suspicions that another great great grandfather may have been illegitimate and that the people shown on his death certificate as his parents were actually his grandparents.