Hello, Welcome to Just Answer and thanks for your question. How late is your period?
Sorry about that. I am so accustomed to answering questions about pregnancy tests.
Sometimes the ovulation predictor tests can be frustrating to use. The tests must be read precisely. There is no "almost" positive. It should be clear as day whether it is positive or not. If there is any doubt, consider it a negative.
The digital kits are a little more accurate than the strips, but they are not 100% either. I would wait and check again in the morning. Meanwhile, you can try intercourse since sperm can live for up to 5 days after ejaculation.
It could have been, but I'd still try again in the morning with a fresh digital test. It could also have been a bad lot of tests.