Lack of sex in marriage

Okay ladies...so I need advice, i dont know what to do anymore. My husband and I have been together for 3 years now and just married in August. Ever since we moved in together his sex drive has been very low, and I've considered EVERYTHING that it might be (no hes not on meds,no hes not depressed, no we are not arguing). When I asked him why we weren't having sex his response was "If you want it then just take it, I will never deny you for sex...but that's just how I am...I have s low sex drive" it started to really get to me because I kept thinking there was something wrong with me. I'm now 12 weeks pregnant and I wish he would initiate more! I feel like every time it comes up it's an argument and I dont want to argue....I'm sexually frustrated. How should I approach this problem....AGAIN