Yellowish CM BFN Pregnant?

Kasie • Hubby and I are 27. We have an amazing 4 year old boy and beautiful 5 month old twins.💜💙💜
So for the last couple of days, I have had yellowish, egg white looking cm. I had what felt like a million butterflies this morning. Drinking water made me vomit  and now I have a mild lower back ache. I am 11DPO and keep getting BFN's. Could I still be pregnant?

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