Peeing in cup at doctor appointment

Courtnie • I am 22 and I'm a Mother of a healthy happy lovable 2yr old son . && I'm expecting my second prince 7.14.16 💝
Each time you go to your obgyn appointment and they make you pee in that cup does that determine your hcg levels???? Bc I'm always peeing in my cup and with my miscarriage my levels were low and they brought that to my knowledge and now with this pregnancy it's nothing at all just "okay come on to the back schedule your next appointment and we will see you next time" which is good news to me meaning that nothing is wrong but wouldn't they be able to determine each time your hcg levels the reason why they make you pee in a cup or is it just me??? Or am I just crazy lol