Gaining Weight From Sex?

So recently, like about a month ago I lost my virginity to my boyfriend and everytime we have sex we go 3 rounds, sounds crazy but it feels great, anyways so we have had sex I'd say 10-11 times within the month of me losing my virginity and I am noticing changes in my body, I look like I'm getting curvier and gained 2 pounds which is exciting because it's very hard for me to gain weight anyways I just wanted to know if this was normal? Thank you