Yes, it can be quite normal, especially if there has been a lapse in medication or even from having an infection/cold etc - it can play havoc but then these ‘blips, should go back again to undetectable.

Yes

You don't need to stress about it ,It is normal as long as you taking your medication accordingly and some physical exercise

Yes, it can be normal, somewhere along the line you either didnt take your medication, regularly or also you could have had a sickness, and had other medication which cancel the hiv meds, and also maybe not eating meals, skipping. Not having alot of essential vitamins, not protecting your self during intimacy. But anything can contribute to that even stress. So i pray you dont stress about it because it will only make you depressed and cause more issues. Rather focus on eating properly, getting your vitamins and excercising snd just living each day step by step. Dont focus on negative things be positive and you eill be ok again