Please help... I'm super worried

I'm 16 and on the pill, because of that when I had sex a month ago I thought it was going to be ok that I didn't use a condom (I know the pill doesn't stop std's but I knew he didn't have any). Then a couple days later I realised that I was taking the pill from the wrong day and that I must have accidentally skipped a pill sometime before having sex with him. It's now a month on and I'm really worried that I'm having pregnancy symptoms: I've been eating more, getting headaches, I have sensitive nipples and then yesterday I had a tiny bit of spotting which never happens to me. I'm going to take a test in the next couple of days but just wanted to know if you guys think I might be pregnant just to calm my mind a little. It's so much worse not knowing. Thank you and sorry for the paragraph.