What do you think?

I have always been irregular, there were times i had skipped a month and took a test that showed up negative. Anyways, I took my first ever dose of birth control shot in March 9, was supposed to get second dose in June 9 but didn't have enough money to do that. I still had spotting that ranged from brown to red during the time I was still on shot and even after when I was supposed to get it again. Me and my boyfriend had sex without a condom 2 days ago and he pulled out but it took him atleast a minute to ejaculate. Now my spotting is gone. What does that mean? Is there a possibility I could be pregnant? Thanks to those who answer