Thoughts?

I'm not sure when I ovulated because I started taking opk's half way through my fertile window and they have all been to faint to be positive. I bd on the 5th as I figured this was the safest bet nice and in the middle of my fertile days. I have been super tired, even with a full nights rest. I wake up feeling like I haven't slept. Last night at work I got a wave of nausea when my coworker opened her take out and almost needed to run to the bathroom to vomit. Later last night I was feelingn some very dull cramping. Today I woke up and just feel extra bloated and some constant pressure in my uterus. I don't want to take a test because I know it is to early to get a positive result as my af is due on the 20th and I don't want to discourage my self. I'm trying to wait until a few days before my af to test. Any one ever get any of these feelings so early on and ended up being pregnant? I have a 5 year old and I don't remember feeling any of this when I fell pregnant with her. I just would like to hear some of your input and stories to sort of set my mind at ease and hold me over until I can test.