I highly recommend taking a minimum of 90-120 days off, when you’re about to come off - make an appointment with an endocrinologist, tell them everything you’re on and that you’re wanting bloodwork (depending on the ester it could be 14-60 days after last pin of Test).
Most endocrinologists laugh at the PCTs most people recommend online, and will prescribe you what they deem as “appropriate” post cycle remedies if they feel you need it after seeing blood work.
For reference - my last cycle was such:
Test Prop 75mg/day weeks 1-24
Tren Ace 75mg/day weeks 1-12
Anavar 50mg/day weeks 18-24
When I came off cycle my endo tested my blood 21 days after my last pin of Test Prop - my total T came back at 220ish ng/dl but my free T, estradiol, LDL, FSH and SHBG were all relatively normal or low normal range. My endo opted to not give me anything at all and to get more blood work 60 days later. After waiting around for appointments and blood work return time I’d have been off cycle for about 85-90 days and my T returned to my “normal” genetic range of 350ish ng/dl and we resumed my very low dose TRT regiment to bump me back up to 800-900 ng/dl so I can carry my mass.
TLDR; I didn’t take a PCT last cycle, yes I lost some gains and gained some BF % but overall was happy with the 5 pounds of lean muscle mass I was able to gain and KEEP per the dexa scan.
Go see an Endocrinologist, talk to them and let them guide you but you have to come off cycle eventually.. especially when dealing with Tren.. it can kill you.