Hello,
The tampon may have come out. However I would advise consulting a gynecologist for the lost tampon because manual exploration on your own can cause the tampon to go further up in the cervix or uterus. A gynecologist can apply sim’s speculum and easily locate the lost tampon during pevic examination. Please consult a gynecologist soon as any delay can cause pelvic inflammatory disease or infections.
I hope it helps. It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your doctor. I sincerely hope that helps. Take care and please do keep me posted on how you are doing.
If you can't find it when squatting, you could see your ob-gyn and have him or her look for it. Lost-tampon appointments are not uncommon, so don't be embarrassed.