M.G.
I tested positive four days before my missed period for both my twin pregnancy and singleton pregnancy. With my twins my hcg level didn't come back suggesting twins. The ultrasound at eight weeks did! The range for twins falls within the normal range for a singleton. Using the levels alone isn't an indicator. You might be feeling more fatigued (I was wondering why I was sooooooo tired), nauseous, or growing quickly (I truly thought I was eating way too much and packing on fat quicker than I should since I was in maternity pants at eight weeks for my first pregnancy). Anyway, if it is twins, congrats and good luck!