with my first i drink caffine the whole time i was pregnant and baby was fine
I went cold turkey on caffeine the day after I got a positive home pregnancy test result at 4 weeks pregnant. I had a 8-cup of coffee a day habit (my job's a killer sometimes) so it wasn't easy, but my baby wasn't hurt as far as I can tell from my early caffeine consumption. I think if you're pretty sure you are, you might at least try to limit yourself to one or two cups a day until you know for sure, just to be safe.
Also I have a feeling that I am because we didn't use a condom pretty much this whole month.