Is there a possiblilty that I could be pregnant?

Hi I am nearly 18. In october my ex-boyfriend and i had unprotected several times but each time but he pulled out. Is there a possibalilty that i could be pregnant? Ive not had a proper period since October and i have been off my food and not eating much. I have been puttin brown sauce on everything i do eat and i dnt even like it. Also i have been getting popping and gurgling in my belly and wee things like little kicks the past few days. Please help me! Ive done a test but it was negavitive!!