about HCG numbers - it is just hard to relax at the beginning, the bottom line. i always say - stay positive if it looks good - why not? why stress now? if the result you dread maybe comes, you'll have enough to deal with then. so focus on it being the result you want, be happy, be faithful (until, if must be, proven otherwise)
i had so many rounds of coaching that to myself , and from all that experience i think it is the best policy
yes, "they" say is right. the number is fine and you need to see it go up in 48 hours by around double (not nec exactly double). i bought really cheap and accurate pee tests (dollar tree here in USA) and could use them to check each day that at least the line was not fading...
to track weeks, i have always insisted, they track from conception day (which we all know bec it happened in a petri dish) then add 2 weeks backwards. whether or not that was your actual period date.
so, if the sperm met egg on the 17th of a month. then subtract 14, get the 3rd of the month and count forward your weeks from there. i had to teach many a practitioner to do it this way , regardless of when my last period was
all the best,
mermaiddance +2 now...