period 13 days late

my period is now 13 days late... I've taken a few dollar store tests and all negative.... just wondering if any of you had to get a more expensive test to get a positive? Maybe it's just wishful thinking on my end to think that may give me a positive. my lower back is killing, my boobs are starting to be sore, easily irritated lately but that could also mean my period is on its way... not sure what to think anymore.... I drive myself insane lately wishing it was positive. everyone around me is pregnant or talking about it and it's making me so depressed as we lost our first baby in November... was a missed miscarriage at 7 weeks.