could i be pregnant?

i already know what everyone is going to say, "take a test and find out" that's not the answer im looking for. so if anyone has something to say that could actually help me please do. my period was supposed to come around the dates of the 17th or the 25th. and it never came on either of those days. and even if i were scheduled on one of those dates, i would still be more than a week late for both. with that being said, i do have severe lower back pain and ive been taking antibiotics in late march for a uti. could those be possibilities why im late? i already have the mind set that i could be pregnant. but i also do have some symptoms of PCOS. what COULD be happening other than me being pregnant? the lastest my period has ever been was 10 days and this is completely out of the norm for me.