Symptoms with twins

Amanda
Before we found out we were pregnant with twins (we took Clomid so we knew there was a 10% chance) everyone joked with us about there being multiplies (they thought it would be triplets, just twins thank goodness) I read so many stories of women and their symptoms... Severe morning sickness, early positive HPT's, very dark lines on HPT's, HCG levels that doubled, tripled, or quadrupled very fast, and gained weight very fast....I didn't have any of that! Anyone else? I'm 7w5d and I don't have any nausea what so ever. My only real symptom is I pee a lot and I'm super tired. My back hurts a little but my boobs aren't sensitive, no constipation etc.... I know I should be thankful but it makes me nervous.