He won't have sex with me!! Advice!!?

Katie • 27 years old, married
My DH won't sleep with me out of fear of my low placenta causing complications. We haven't been advised to avoid sex but he is convinced that should something happen it would be his fault and that sex could trigger issues. We've not had sex for 6 weeks and tbh I was quite enjoying the peace at first but now feeling like we are missing out on time together.he is still so affectionate and caring but is clearly terrified. He wants to wait til our 4d scan to see if there is any improvement on the position; which is in 2 weeks (il be 26wks)
He and I are celebrating our first wedding anniversary this weekend and although I'm so happy we're going away together its not going to be the romantic break I had hoped for!! 
Any advice on how you calmed your partner down when they had fears?? Or did you choose to abstain also?