Unprotected sex last Sunday night,
I had my period two weeks before that.

When do the symptoms start showing
and when is the right time to take a pregnancy test?
Thanks.

Not until I was about 7 to 9 weeks pregnant, believe me you wouldn't know yet.
Different tests work in different way's some not until a few day's after your missed period, other you can take as early as 5 day's before your expected missed period.
If you don't want a baby, stop having sex.

The soonest symptoms will show is 2 weeks from then, soonest test would be 6 days before your next period with the first response brand

i didnt know i was preg w my 1st baby until i was already 4 and 1/2 months. my 2nd, i was 2 months before i found out. no symptoms at all

One option would be to take the morning after pill asap.

My period is due. I have no pregnancy symptoms and no period symptoms. I ALWAYS have really bad period symptoms. This is weird. I should be having extremely sore breast and cramps by now. I should of had sore breast a few days ago. I feel nothing. Sore Breast is one of the symptoms of pregnancy so could I be pregnant with no symptoms? I live out in the middle of nowhere and don't want to go all the way in to town for a preg test. how many of you got pregnant and had no symptoms?

My mother did, when she had a brother of mine. She didn't even stop having her periods. The brother was born very thin, and the doctors didn't even want to tie his cord. My mother insisted, and he is in his 70's now.

Sorry if TMI, but apparently the one thing that changes in the majority of women is that your nipples get quite a bit darker….i thought mine had tanned through my bikini but when I asked my midwife she said it happens to a lot of women!

You can actually have no symptoms or the opposite of what you would normally consider signs.
Read
Uncommon Symptoms of Pregnancy
ehow.com/facts_4813209_uncomm…

for more information. good Luck!!