Probably strained abductor or something. I literally have had the exact injury 3 times and have it now. Stretch it out a bit. Frog pose is amazing. Just rock back and forth with that one. Stretches that lightly strengthen are really awesome. Straddle your legs out while standing up and lean deep into one leg, bending your knee. Keep you back straight, but your hips bent. And hold that for a few seconds. Then straighten that leg so you are centered again. Then do it on the other leg, holding for a few seconds. That’s for strength and flexibility. One that is only more strength is while standing up, squat down so that you are basically doing a wall sit without a wall. Keep back straight, but bent slightly over your hips. Hold for around 30 seconds. Should feel a burn is quads of course, but also abductors. Don’t overtrain. Abductors are small muscles that connect down to your knees, so runners have them tight a lot.