Please help confused ;/

I have attached my Callander so I don't confuse everyone but I haven't got my period this month I was actually due the 29th and normally spot on my 20 day cycle I've had cramps the last few days but only on the left side really low down and today I've had a tiny bit of brown discharge but no bleeding ?? I'm feeling sick after I eat very tired moody and very sore sensitive breasts anyone else have this ?? I've taken 2 pregnancy tests one on the 26th and one yesterday but both neg ?? Could I still be pregnant ?? ​