I Had Unprotected Sex On Dec 20th 2016 With My

I had unprotected sex on dec 20th 2016 with my boyfriend and I throw up one day on the 27th of dec 2016 and I have my last period on the 28th of dec 2016. we had unprotected sex again on the 1st but I was just spotting after we had sex I was still spotting for about a day or so then a couple of days ago I have had sore breast mild cramps and I have this clear watery discharge. Does this mean I could possibly be pregnant? I haven't taken a test yet but I needed to ask someone about this before I did so. I know that I don't have a UTI or a yeast infection.