Pregnancy or PMS?

Lately I have been extremely worried that I could be pregnant, to the point I'm driving myself insane. I am on the pill and have been for over 5 years and I take it everyday. My last period started Nov 12 and I had on 21-25 of nov however we did use a condom and pull out. I also had protected back in October from the 18th-21st. Recently however my have been a little sore and my veins have been very noticable on them. One morning I was a little queasy when I woke up but that was only one morning. Since oct I have taken 4 pt and they were all negative. I was wondering if the veins on my s could be a PMS symptom or because I have been working out more, or if I could possibly be pregnant. Thanks