After switching to Dolutegravir, is viral rebound possible?

Hi doctor,

After 21 months since my HIV (human immunodeficiency virus) diagnosis and have been undetectable for 15 of those months, two months back, I was switched from the effective Truvada or Tivicay regimen to Triumeq. The sole explanation was that STR (single tablet regimen) was more convenient.

I am yet to do labs with Triumeq, but I have three concerns at this point:

• Was there any possibility of a viral rebound or a significant blip, five to six weeks into Triumeq use, due to a new combination of drugs? (I have 100 percent adherence and take medicines always at the same time, more or less two hours).
• Due to some intensive driving trips, on a few days in the last two months while already on Triumeq, I had a can or two of energy drink shortly (certainly less than two hours) after taking my medicines and without realizing it contained some magnesium (about 7 mg per can). Is this a significant enough amount to interfere with DTG (Dolutegravir) absorption and thus efficacy? The Triumeq guide instructs avoiding calcium or magnesium-containing antacids, but their quantities are usually much higher. In my case, this was less than in a medium-sized banana.
• While maintaining my UD status, how risky to my negative partner was the following episode during a sexual intercourse with me being in the receptive role? He briefly inserted his penis rather deep into my rectum without condom and instantly had a tear at the top of the penis where it connects with foreskin. He pulled out right away, but his wound was already bleeding rather profusely. Was he at high risk of HIV infection, despite my UD status?