10 days past 5 day blastocyst transfer

Morning ladies the HCG level thing is confusing!! Many people say it should double every day but lots of sites say it should double every 36/48 hours initially. HCG on Monday 6 days past transfer was 23.5 yesterday 10 days past transfer 272. Progesterone steady at 190 and estrodial steady at 3670. My clinic are delighted and said couldn’t ask for better. HCG calculator says good to high increase just worry when I read about doubling daily. Mine is doubling every 28 hours so far. Anyone got information to make me feel better. I feel relief at how happy clinic is. Maybe shouldn’t read to much lol xxx