11 dpo...negative result

according to glow in 11 dpo. I took two tests today at different times. both negative. thinking of trying again in a few days. my period is expected on the 30th so maybe if it's late I'll try that day. 
really thought I was going to get a positive. I've been really not feeling myself. but maybe it's just a combination of my period coming and all the hot hot weather we're having here. 
anyone else test 11 dpo and got a negative but then tested later and it was positive??