Unexpectedly Pregnant?

Ka
My husband and I aren't trying, and we only had sex once during my fertile window... 
My period is due today, and I had bright red spotting Monday and Tuesday (10-11dpo). It was similar to the day before my period starts when I have spotting. 
Anyway, I went ahead and took a few pregnancy tests and an ovulation test (I heard they can test positive if you are pregnant). They all say positive (see photo). 
I don't feel pregnant though. Last time I was pregnant, my boobs felt like they were going to fall off, I was really hot all the time, and I was exhausted. This time, nothing. What are the odds it's just a chemical pregnancy??  Could it be a normal pregnancy without any symptoms???