I am very worried because I was supposed to get my period yesterday and I still am not seeing any sign of it. My husband had a vasectomy a year an a half ago because I was so worried every month about getting pregnant and it was causing me major aniexty. He had it done by a top urologist and was given the all clear after 13 weeks. I am so worried that we could be one of the very small percentage where somehow a sperm found it's way through. I am 41 and wondering if this is the start of irregular periods in the years leading up to menopause. I took a HPT today and it was negative but I am still worried. I did have a urinary tract infection last week that they gave me antibiotics for but I don't think that would have an affect on my period?? Any help you could give me would be much appreciated.