Is Bloating,muscle Spasms And Twitching In Stomach Symptom Of Pregnancy?

Hello. I am taking birth control pills, Yasmine, and I usually take them around the same time. It doesn't happen too often that I am more than 12 hrs late. My periods are very regular, I've never missed one, although my last period came a day earlier than usually. Lately I feel extremely paranoid that I might be pregnant. I am definitely not in a point in my life where having a baby is an option for me. I study in a foreign country, I am not ready for a child now. I am in a committed long term relationship and I have never been intimate without protection. The last 2 months I've been unusually gassy and have had a lot of movement, muscle spasms and weird twitching in my stomach. I have not gained any weight but I feel a bit bigger in the mid-section, I am pretty slim generally. I have taken several pregnancy tests over the last 2 months and all have been negative. The last one I took was 10 days ago and I did it with the first urine in the morning. I have no other pregnancy symptoms besides the weird sensations in my stomach. I also have had some very mild spotting once this month and once last month. I should get my period over the weekend.. Over the last couple of days I've read dozens of stories about women with no signs and negative HPTs ending up pregnant. I know I should just visit a doctor, and I am planning to do so first thing on Monday. I know I sound ridiculous, but I cannot stop obsessing about it. Still if you could find the time to tell me what is the probability of somebody in my situation with my symptoms(or lack of) actually being pregnant, I would be very grateful!
Thank you!