Did you have any previous pregnancies? Were they difficult? This picture appears to be rectum peeping inside the vagina due to muscular weakness which happens due to difficult deliveries. You can just put your two fingers in the vagina and strain for stools. If you feel something peeping it from behind, that is what I am suspecting. Please get examined from your Gynaecologist. If it is rectum peeing, what we call as rectocele, later on it may require surgical correction otherwise it may lead to uterine prolapse in future. However, minor rectocele may not cause any problem during delivery. I hope you have got the guidance.