Kind of confused.

My period finished a couple of days ago, it only lasted 4 days, kind of. Day one was pretty much nothing, day 2 was very light day 3&4 were like kind of heavy (only had to change 2 times those days). And then nothing but a spot or two on what could be considered day 5. Today my boobs are really sore and I don't know why, I don't usually have sore boobs at all, I've had it maybe twice in my life. I mean I had my period so it can't be pregnancy right? The only other thing I have noticed is being really tired and getting sick after I eat anything. I am TTC but I don't know if I want to waste another test taking as I believe I had my period.