I dont think that you can get preg when you have sex during your period but maybe im wrong, and hopefully someone else can answer that for you.....

If you were to be pregnant, you star to feel the symptoms when your about two weeks (and that would be cravings and maybe morning sickness, irritability, tired stuff like that....) not all the symptoms happen to everyone. I didn't know I was pregnant till I was about 1 1/2 mts. But what I do remembered and realized was...All I would eat was chicken roman noodles, and that I was a complete b*tch!!! Lol luckily, I didnt have morning sickness(which can be anytime of day or night) except once and it was at night.

I think your other question was "when do you think is the best time to take a pregnancy test?"
and my answer is:at the least, 2 weeks after you miss a period or you think you may have concieved.

It is possible to get preg on your period expesially that soon because the egg can still be fertilized and latch on. And the whole he didn't 'cum' in me thing don't work because of pre cum.