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It is unlikely that you are pregnant if you were on the Depo shot and he withdrew. The brown discharge and feeling sick could be from hormonal changes or other causes, not necessarily pregnancy. Nausea can occur for many different reasons such as food poisoning or stomach problems. If you are concerned, take a pregnancy test to ease your mind. 

The size of a 12-week-old fetus's head typically measures around 2 cm during a scan. The infant's head undergoes rapid development during this stage, and these measurements are crucial for assessing their growth. If there are no concerning symptoms, this size is generally within the normal range. Nevertheless, it's important to continue attending regular check-ups and follow your doctor's advice to ensure that the pregnancy is progressing well.