How do you know....

Ashley

So I keep seeing other ladies posting on how their hcg levels keep doubling every 48hrs, well how do you know that? Sorry if I sound dumb, this is my 2nd pregnancy (30 and I had my first is 6yrs old) but I guess this wasn't something I tracked every 48hrs or knew you even could. I always understood you didn't know unless you went to the doctors... Just a curious lady over here.