Transfeminine people having monthly cycles is something that a lot of people have discussed, so I’m inclined to believe the phenomenon is real. I do seem to have a slow week once a month. It’s my partner who has normal periods once a month who has suggested I am cycling. I can’t say for sure what’s going on. There’s a lot of stuff about trans people that isn’t well studied. I do take progesterone but my dose is constant, so either my body processes it in cycles, or something else is happening, or its coincidence.