HELPPPPPP! vvvvfl

I took ovidrel on saturday April 29th. Last month I tested it out and it was completely out with completely negative pregnancy test in 7 days. Well I just tested just to see and I have a vvvvvfl. Any advice on if it's possibly the ovidrel or is it real. I will continue to test over the next week seeing how hubby and I are going to Vegas this weekend for our birthdays! I want to surprise him!!! Tell me what you guys see and think.