Is Lexapro messing with me? Or am I pregnant??

I need help!! So I've been on Lexapro for 10 days now (since last Tuesday) and I was supposed to start my period yesterday. But, there's nothing, not even spotting... There's a chance I could be pregnant but before freaking out I'd like to know if it's possible that the medication is messing with my body that much... Like, is it making me skip my period and altering my reproductive system or something?? Haha. Thanks in advance!