I had this too where my symptoms would go away for a day or two and then BAM they would come back. If you really need reassurance you can get an ultrasound, but at my 6 1/2 week appt. they couldn't really see anything so that was almost worse than just waiting. Its up to you, you know what you can handle hearing, it was hard for me to wait another 2 1/2 weeks for my next u/s but everything turned out just fine. Good luck and just know that you are still really early, most of my symptoms didn't kick in until 6 or 7 weeks!! Keep us posted and congrats on the pregnancy!