nastabasta

if you have a normal 28 day cycle you should be able to test by the end of the month or early april. if your cycle is 28 days, you probably ovulated around the 16th and should be able to test around the 28th.
as far as eating fish, i have never heard that you can't have any fish at all when you are pregnant. i've heard that you can't have raw fish (sushi) and that most experts tell you to avoid fish that are at the top of the food chain (tu such as tuna and shark) because the amount of mercury in them is higher than it is in smaller fish. that's because they eat smaller fish and build up more and more mercury in their system.
most doctors would tell you to keep up with your exercise routine. however, since kickboxing is so high impact, you'll want to check with your obgyn to make sure it's safe. you may have to tone your routine down a bit.
everything i've read says that one cup of coffee a day won't hurt. but personally i know i won't have it when i'm pregnant. better safe than sorry, right?
hope this helps and please keep us updated.