Symptoms fluctuate throughout the day

I'm only 4.5 weeks pregnant but I've noticed that my symptoms fluctuate throughout the day. The only symptoms I have are sore breasts/nipples and cramping with some back pain and a little fatigue👌. The day of and the day after my period was to come my symptoms were intense. Now i still have sore breasts and cramping but it doesn't seem as bad. I took a pregnancy test yesterday evening and the line was even darker than the last test I took. Is this normal? Has anyone else experienced this?