My first sympton stared about 10 days after ovulation...a metallic taste. I am now 5 weeks pregnant now and the metallic taste has gone but my nipples are so sore and I am always hungry.
Most simptomes start at about 6weeks of pregnancy!!!
I agree with tamtam, only I've also seen that you're 17. I've said this to another girl as well, she's about your age, that the eating thing can be very well related to puberty. Your hormones are still trying to get balanced at that age, which can cause you to get the munchies or not wanting to eat anything. It is possible for preg. signs to start that early, however they usually start around week 6 (that is 6 weeks after your first day of your menstrual cycle).
Do you know how long your cycles are? The 28 days thing doesn't really work if your cycle is 36 days, which can happen. Wait till the day you more or less expect AF to show, wait another day or so and then take the test.
yeah signs can start then eg nausia, loss or gain of appitite, sore brests, darker nipples, LATE AF LOL, tiredness, and that is what i feel keep in mind if u take the test too soon like no it may show up NEG as u maybe to early ok id wait till the 11th and fingers crossed for a BFN. your signs are normal for around 10 days in my opinion.
keep us posted