Hello,
Welcome to ehealthforum and thanks for writing
Since you already have conceived three times it should not be an issue again.The symptoms described by you as lower abdomen pain,increased vaginal discharge can be suggestive of possible pregnancy.
Right now just wait for the periods and if they are missed then get a Urine test done for pregnancy determination after a week.Kindly visit a Gynaecologist for evaluation.Have healthy balanced diet and avoid any strenous activity.
Take care!