Your teeny-tiny babe is nearly a half-pound (burgers, anyone?) and looks very much like a human now; everything is just in miniature. Those telltale swirls and lines are forming on the fingertips and toes (unique to them, should they ever be arrested and finger printed), and the eyes are finally looking forward rather than out the sides of the head. Meconium, the first bowel movement is now very slowly accumulating in the bowel. This is the first mention of baby poop - something you will become more than accustomed to in around five months.
If you notice your tummy jerking at regular, short intervals, it isn't the heartbeat or something gone horribly wrong. Your baby may actually have the hiccups.
Experiencing lightheadedness, faintness or dizziness is normal during pregnancy. These symptoms aren't harmful unless they occur all the time or are very severe. A change in position can easily cause your blood pressure to decrease, as your cardiovascular system doesn't react quickly enough to compensate because of your increased blood volume. Stand or sit up slowly, breathe deeply and relax. The dizziness will pass (you can also just pretend to be pregnant AND drunk. That might be fun).
You also may be feeling slighty off balance, as your body tries to readjust its center of gravity. Carrying around a uterus the size of a cantaloupe can do that to a gal.
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