4 weeks vs 5 weeks

I started getting morning sickness (nausea but no throwing up), insomnia, food/smell aversions, minor cramping throughout the day, and breast tenderness at 4 weeks. I also have a FitBit and noticed that my resting heart rate last week was 78-80 BPM.

Over the past few days my symptoms have started to level out. I don’t feel nearly as sick or have as many smell/food aversions. I’m sleeping better (still not normal though) and my cramps have decreased. Most concerning is that over the couple days my heart rate dropped to 77, then 76. I read that it’s normal for a pregnant woman’s resting heart rate to increase 15-20 BPM and mine hasn’t done that. The only symptom that has stay consistent is my breast fullness/tenderness but even that’s mostly at night.

Should I be concerned at any of this? I feel like I’ve seen so many stories of MC on this app that it’s starting to scare me.