Could i be pregnant, to soon to test?

My last period was may 9-18 and i irregular and my period usually comes 2 weeks after my period ends it's 2 weeks today, my period before my last was 23 day cycle too so could this be pms or pregnancy symptoms, i took a pregnancy calculator and it would be 3weeks 6 day pregnant and i fell pregnant on may 20 but my period ended may 18 so 2 days after my period ended, not sure but i irregular so i don't know. I've been having crampy lower stomach and it just feels weird like something is going on, lower back pain, tossing and turing in sleep waking up in mid night to go pee, very tired and husband says i've been bitchy