Lack of urination

Since Sunday(06/12) I’ve experienced lower blood pressure for me of 106/65. I usually be in the 125/80 range. I’ve also had a headache, swollen ankles, back pain, and nausea. Is my blood pressure too low? What could cause lack of urination? I haven’t been to the doctor or hospital because its my first pregnancy and not sure if these symptoms are normal. :( help please!!