the iron clad way to know if your shit is legit is running bloods before your cycle and then 3 weeks into it.
i will tell you in 5 seconds if its legit from that.. see my signature on how to run bloods.
assuming your HPTA was healthy going into cycle your LH and FSH would drop.. some of your lipids will become more strained. and your T levels would jump. thats why getting bloods BEFORE and during is important.
a lot of guys go into cycles still suppressed or even with still hormones leftover in their systems!! so its crucial you run before's as well to make sure things are straight