i bet you get over 2 oz off that, if you don't chop it early, so don't chop it yet. if you refuse to get a loop or scope, wait until at least 80% red hairs, it will stop getting bigger. wait about 2-3 days and the buds might start to "swell" and they get even bigger. you will see it if you pay attention, when that stops, cut it. your bud still has time to grow and swell. let it.
with a scope its more accurate as some strains don't act like this, so it is the preferred method, as others before me have stated. go out and get something to view the trichs.