11dpo and very nauseous and sick

I woke up this morning and took a test I'm pretty sure it's a BFN but I can sort of see a faint line. I went to get ready for work and got so sick and threw up. Yesterday I had to use the restroom very frequently which never happens for me and then had more cramping. I am seeing symptoms that I usually don't get with my period. Can I still be pregnant and just tested to early. My cycle can be off and long like 35 days sometimes.