Doing a cycle while on HRT help please

[ALEX1971]

Hello guys, I am 38YO (5'8" tall 155 Pounds) and I have been on HRT as per my doctor for about 1 year and half. My Doctor put me on HRT because I am an HIV patient and I wanted to get bigger. I have been getting 200mg testosterone cypionate every 2 weeks for a year and a half, but I have not seen the gains that I want to get.
I have been researching about steroid cycles for beginners and I decided to do a 400mg/week testosterone cypionate 12 weeks cycle, which I already started a month ago.

Now here come my concerns and I would love to see your opinions:

Since I am on HRT do I need to do PCT before going back to HRT? or I just go straight back to HRT?

I am concerned about keeping my testicles on a normal size, should I use some HCG to keep them normal size during HRT or the Cycle? what amount should I use?

I do no want to get bitch tits either, should I take some tamoxifen as well?

Would my Doctor find out I did I cycle when he sends my next blood test?

Any experiences on this subject would be appreciated, Thank you,