@emaries Not @leghurts54, but the long-time owner of double hip implants, plus 3 revisions (not for stem pain.)
My first question is always - Have you discussed the issue with your surgeon? If not, I suggest you do so at once, so they can evaluate the implant and whether is is still healing properly.

Here is something they fail to stress enough when you are considering surgery - this is a "big deal" surgery, where they cut bone, disturb (even if the don't cut) tendons, muscles and nerves, hammer an alien material into your body and sew you together. That means healing takes time - sometimes as long as a year - before everything fits and feels normal. So even if you are up and walking, doing PT and going about daily life, your body is working hard to heal.

Some things to consider -
First, sometimes the process (cemented vs no cement), stem shape and length, and stem placement can cause the pain. That is why careful evaluation by the surgeon is needed.

Being very active after surgery has been cited as one possible cause for the pain. Try treating yourself as someone "in recovery" and rest your (elevated) leg whenever the opportunity presents, icing a couple times a day to reduce any inflammation that is present. Also, at 3 months post-op, ask your doctor if it is OK to use ibuprofen to relieve the pain, and try to stay ahead of it.

Finally, nerves may have been damaged or irritated during surgery. These take a LONG time to heal, and patience is the only treatment.

Have you tried rest, ice and less activity to ease the ache? In early days after my 2 hip replacements six weeks apart, I was determined to "get going" as quickly as possible - after all, I was a healthy 54 year old who had things to do! I really believe I hampered my own recovery with that approach. Twenty years and many other surgeries later, I know better, and I give myself time to heal.