Thank you very much.
Yes this can be a groin muscle pull, and this may take some time to settle.
Muscle relaxants in addition to Advil will be of great help here.
Tizanidine, Cyclobenzaprine, or Orphenadrine are of great help and relax the pulled up muscle.
Additionally, there is possibility of a hernia, but in the absence of a swelling this seems unlikely.
Gentle stretching of the muscles.
All will help.
If this persist, does not improve or gets worse, have this examined by your doctor.
Wish you good luck.
It was a pleasure assisting you and i hope my answer was helpful. I will appreciate 5 Star Rating (Excellent Service) & a Bonus as this is the only way i get credit for my time & expertise. Do not hesitate to ask any follow up questions or clarifications any time.
I would have been worried too if i were at your place but let me reassure you that this is a treatable condition and carry a good prognosis with appropriate management.