help is my daughter pregnant

Ca

help, my daughter as done 4 tests two positives two negatives Wot does this mean. last one was a clear blue and it said not pregnant but she's 110% that she is , waiting for more home tests to be delivered, or is this just to early to test, she as no periods at all only light spoting now and again due to the mini pill that she as stop because of bad side effects.and she as systs on the ovaries .