What do you think?

Last had sex with my SO on the 7th, period was due yesterday and it's late. Took a test a couple days ago and it was negative. I had some light spotting for four days between having sex and taking the test.
 we had sex again on the 24th. We use the pull out method and are always really careful with it but there's always a chance.
​How likely is it that I'm pregnant?