Hi,
I can understand your concern and that is one of the reasons DH & I didn't have sex b/c increased chance of m/c. (We'd had two m/c previously) We have only DTD a couple of times and it has been in the third trimester! (So yes, you can make your dp wait!) I personally wouldn't be DTD until later on in pg when the risk of m/c is reduced. Please note that this is my personal opinion only and perhaps you should discuss this and your concerns with your health carer