Symptoms at 4.5 weeks pregnant?

Those of you who found out this early, did you have any symptoms? I'm 4 weeks 2 days today and the only thing I've noticed is minor cramping. I'm a little worried b/c we did IVF and my HCG at 3 weeks 6 days was 101 which was a good strong number. 48 hours later, at 4 weeks 1 day (yesterday), it was 168...still considered doubling within the 48-72 hour range but my progesterone level fell from an 11 to an 8. My RE said to be cautiously optimistic. I would feel much better about this if symptoms kicked in already!