Thank you for writing
Exercising is good for health with cardio and weight training
but before starting your work out you should do warm up exercises and after compliting your work out you should do cool down exercises this is the perfect way to do exercise......... and please dont do exercises with out any guidence of couches which hurts your joints and muscles...
Coming to your problem it may went wrong while you are exercising so check your shoes whether they fitted your legs or become loose or tight and use good quality of shoes while doing work outs and consult orthopedician for pubis problem and follows his suggestions....
None of the Lower ab exercises hurts Labia majora
untill and unless you done exercises in wrong way so,once go for x-ray or MRI
if necessary and consult a DR for further suggestions
For further query writhe me back