Symptoms before a bfp??

Tonight I've come over really sick like to the point where there was saliva in my mouth. Couple of minutes passed then asked OH if he could smell red cabbage,he looked at me as if I was stupid! So I took a test when I got home and it was negative. It was at 6.30pm so I know my urine was weak so il test in the morning. I'm 8dpo. So what I'm asking is can you have symptoms before you get a bfp?