no sex for 3+ months

I'm kinda upset and disappointed that my SO and I haven't had sex since we found out that I'm pregnant. He was worried it may affect our baby and I've been to the doc and assured him that it's fine. I tried seducing him and saw that he get aroused but he just doesn't touch me anymore. We haven't been very active in sex and now it's worse...sobz...any ideas or suggestions?