Help!!!!

I don't feel pregnant at all this morning! I'm 5 weeks 3 days. My heart is not beating extremely high this morning and my cold symptoms have improved which is great. However, I did feel a lot of pressure last night in my last lower abdomen. There's no blood or cramps. I just feel normal. Is this a normal part of early pregnancy? Should my heart rate stay high?? Just a little worried, because this is my rainbow baby.