If he is long enough to poke you in the cervix, be careful, as you want to avoid that.
Other than that, support your stomach and make sure that he knows not to put alot of pressure on it. But sex during pregnancy is quite healthy for you as long as you're both gentle with it. [ WittyUsernameHere's advice column | Ask WittyUsernameHere A Question ]
S_C answered Sunday September 16 2007, 7:18 pm: Yes, it is completely okay to have sex during your first month of pregnancy. It's okay to have sex during your second, third, fourth, and so on.
As far as I know it is encouraged and/or healthy as long as you are comfortable and you and your mate enjoy it.
If it makes you more comfortable here are other sources that say it's okay too.
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