I am 6 weeks and 5 days pregnant. This is my second pregnancy. I have been having mild back pain from the time I have known I am pregnant, even before that. No other pains. Stomach feels bloated and thighs feel fat. Physically, it feels like I am 5 months pregnant when I am still in my first trimester. I did it a lot of physical work today and barely took any rest. At night, I noticed one spot mixed with my discharge. It's slightly bigger than two dots and looks like how it looks when the period starts - less flow. It's pinkish/light reddish in colour. Should I be concerned? What action should I take next?