Feeling unwanted during pregnancy ! From a mans view...

I'm wanting to know from the pregnant women out there if you feel like you don't want to be close to your man ? Since my fiancée became pregnant about 7 weeks ago the sex has gone to near enough nothing and when we do it's just a quickie,she won't let me cum in her anymore,she's not as touchy feely I.e kissing an cuddling and says she doesn't want to feel smothered ,most of the time she feels sick and says this is the reason why ! Is this a common thing during pregnancy of feeling sick all the time and not wanting to be close ?