Thank your stars that condom stuck inside your vagina has come out automatically. Before going with reasons, please be informed that any foreign object trapped inside your vagina or cervix can lead to a condition called Toxic Shock Syndrome or TSS, which is most commonly associated with usage of tampons.
If you feel any unusual symptoms, or if you feel still there could be a broken piece or torn condom piece still inside your vagina, you should immediately rush to your gynecologist for a vaginal screening.
If you come across any symptoms, it could be because of bacterial spread inside your cervix due to the broken condom piece. A visit to gynaecology will help you take a full scaleSTDscreening and a pregnancy test could save your life from further complications and untoward results.
Now, let us see what could have happened and how to prevent occurrences of this type in future.
Know that condoms are not one-size-fits-all type. Every brand and every variant of each brand of condom comes in different sizes and length. Your partner should know which the right size is for him, based on the dimensions of his penis. Using the correct size of the condom is very important to have a safe and enjoyable sex. Otherwise there is always a possibility of condom slipping off or condom tear during an intercourse.
Also, a male should have a fair idea of how much semen is he going to ejaculate and know beforehand whether the condom tip is sufficient enough to hold the load. If the tip is too big, the weight of the ejaculated semen will make the condom slippery and come off during sex allowing semen to reach your cervix. If he is using a small sized condom, there is always a possibility of tear and a broken piece with semen might get stuck inside your vagina. This is not a pleasant occurrence as it could defeat the very purpose of using a condom. In such occurrence, you can become pregnant and you could also get infected withSTDorSTI.
Condom size charts are available in condombazaar.com / size chart.
So, next time, you measure the size of his erected organ and make him buy the most appropriate condom for him to prevent any such occurrence in future.
If you are not comfortable about buying a condom for him or if he is not allowing buying a condom for him, alternatively, you can buy a female condom. You need not worry about the length or girth of the condom. You can use the one that is comfortable for you. So, there is no worry about condom getting stuck inside your vagina and there is no risk for you at all.
Hope, this answer is helpful for you.