When is a good time to start strength building exercises?
Personal opinion...I wouldn’t be doing so yet. I went to three therapy sessions beginning at three weeks post op and decided PT wasn’t for me. Many like and thrive in PT, I wasn’t one of them. I followed the Activity Progression For THR finding it useful. At this point in your recovery, seven weeks post op, the Activity Progression uses the following activity as a rough gauge -
Weeks 6 and 7
Start taking car trips to the shops but keep them short and sweet at the start, no longer than 15-20 minutes
Take at least one 5 minute rest while you are out.
Activity: ironing, washing, meal prep but get someone else to clear up after, wash up but someone else clears the table, brings you the dirty dishes, dries and puts them away after, not you!!
Weeks 8 and onward
Bed making and changing sheets, cleaning bedrooms etc., can wait until about now by which time, all things being well, you should pretty much start getting back to normal.
This article will be updated in the future with activity that’s more relatable. I mean who irons anymore?

Not me.
The surgeon did that abductor tenotomy on me where he put a couple of stitches in my groin area and left a long string so it could be removed in two weeks. One of the nurses in the hospital said it was disovable and cut the excess string the surgeon left behind. The surgeon said it was not disolvable but when he looked to remove it, the nurse already had cut the excess string during my hospital stay. Now, I am worried I have a suture that may have buried itself under my skin and if it will cause an infection eventually, because the nurse didn't listen to me saying it was not disolvable. If it causes an infection can it affect my new hip??
I‘d call the office today and share your concerns. I’d ask that someone on your surgeons care team speak to your OS about it and get back to you. Don’t wait, it will weigh on your mind. Get the reassurance you need to have peace of mind over the weekend.
I hope you have a good one!