I stopped taking my birth control pills about 3 weeks ago and had unprocted sex with my boyfriend more then once and he did it in me. I got what I think to be my peroid but my body is telling me that I could be pregnant. I've been very sick in the morning and very tired. I have been pregnant before and these were the same signs that I had the first time. Is there a possibility that I could be pregnant or could it just be stress?

Well if you have been pregnant before with the same systems then you know your answer. I would go and do a test.