If you wear a condom during sex and still find an unwanted pregnancy, there are many reasons, as follows: 1. if you don’t use a condom, but only wear a condom during ejaculation, there may be a probability of sperm leakage in advance, so there is still a possibility of pregnancy; 2. if you use a condom for contraception, but the quality of the condom is poor or the condom slips off during ejaculation. If a condom is used, but the quality of the condom is poor or the condom slips during ejaculation, the sperm may be left out of the vagina and enter the uterine cavity to unite with the egg. In order to avoid unwanted pregnancy, it is best to buy regular condoms from regular supermarkets, buy better quality condoms, and use condoms throughout the whole process, and check the integrity of the condom afterwards to see if it has slipped off or broken.