Thanks for writing in.
I think you should take another blood test
(hCG) as well as a trans-vaginal ultrasound
if you are late for your period for a week or so. If it is negative then you must report your overdue & inter-menstrual bleeding
to your doctor & get yourself examined to rule out other causes of abnormal bleeding.
The symptoms you are reporting are not specific to pregnancy
& may occur in a number of other conditions. So, cannot be taken as a hallmark of pregnancy.
Best of luck.