I NEED HELP

Annie

Ok do I am really nervous to ask this on here due to judgment but it's my last resort. On August 9, 10, and 11 I had unprotected sex not realizing I was ovulating at the time! I am no longer on birth control. He pulled out but there was pre-cum and one time he pulled out as he was cumming. I am so worried. last week I started have cramps and other symptoms related to period. Well what I think is my period came but it was very light and only lasted a couplem days. My period is always a week or more long and heavy. Then about 5 days ago I started getting heart burn and headaches. I wake up at around 1 feeling like I need to be sick. I haven't taken a test because I keep telling myself I am not pregnant. What are the chances I am? I also forgot to mention I have been so emotional about everything.