If your period is due on the 6th then im guessing you ovulated on or around 21st.since after ovulation our luteal phase is no more than 16 days.so you wouldnt have ovulated on the 16th.as this would have made a luteal phase of 22 days,not possible.this will explain cramps.this is caused by ovulation,some months we feel it others we dont.
We can't tell you whether you're pregnant or not. You need to test on the 6th and see.
With your symptoms though I would say not to look too far into it. When you start ttc you will notice all sorts of symptoms that you never thought were normal but I think you notice them because you are becoming really attuned to your body. I've learned that in my whole process of ttc.
Good luck and I hope you get some good news on the 6th. That is when I'm due for AF too and I hope to get my bfp.