Doctor, I had a stay with my girlfriend on 4 / 2 / 2018, we had a physical contact that I rubbed my pennis in her part, this is the first time we are like that, there is no ejaculation of sperm, but on that day night and for 3 days she had a brown fluid from her part, and her last period date is 22 /01 /2018. Today (15 /2 /18) she said that she had some different changes in her stomach, vomit sensation, head ache ,back pain, tiredness for 3 days. Whether this is the sign of pregnancy?