I don't feel pregnant anymore...

I'm 15 weeks. I've had severe morning sickness/nausea since 7 weeks. I've also had headaches, muscle aches, heartburn, tender breasts, gas, back pain and last but not least little pulls, fluttering feeling and small random cramps. The last 2 days all I have felt is tender breasts, gas, back pain no worse than usual and I have a gagged a couple of times with out throwing up. It seems my body is progressing properly but it scares me that the cramping, pulling and flutters are less frequent. Is this normal? Or is anyone else experiencing it? This is my first pregnancy to make it this far. Feel free to post about your own experiences! Thanks! 🙂