DP and I had unprotected sex four weeks ago on Thursday. I have felt dizzy, sick and tired at the same time most days, have had increased cervical mucus, cramping on and off, lower back pain, a 'heavy' feeling down below and most noticeably I'm so bloated that I look about 3/4 months pregnant 
I am breastfeeding and haven't had my period back yet so I can't be late but did test today, and it was negative. However, I have never felt so certain I'm pregnant. Three people have asked if I'm pregnant because of the bloating and I'm having to cover up to avoid more doing so. DP can't explain the bloating but thinks I'm definitely not pregnant because of the negative test. I think I could have tested too soon. Aibu to think you can just know?