I think im 4 weeks pregnant but the doctor says im not can I still be was it to early to tell?

4 weeks is PLENTY of time to detect whether or not you're pregnant. BUT, everyone's hormonal levels are different when they get pregnant. Some have spiked levels or hormone, and some you can't even see a major different. Normally, you should be able to detect your pregnancy about a week after a missed period. Some pregnancy tests over the counter let you find out if you are even before your period, but the closer to your period they are, the more accurate.

My friend was pregnant for 4 MONTHS (Yes, FOUR MONTHS) before she found out she was pregnant. She missed her periods, took pregnancy tests at home, AND AT THE DOCTOR'S OFFICE and they all came back negative. No pregnancy test in the world is 100% accurate. Even the urine tests doctor's offices have you take. Having a blood test might pose to be more accurate, although it is not commonly used.