Thanks for writing to us.
The mild spotting you had on 4th april is likely to be an implantation
bleeding. You need to check your urine for pregnancy
using a sensitive kit available in the market. Your periods are already overdue by 4 days. To be more sure, you can get your serum beta- hcg
It is not necessary to have pregnancy signs and symptoms right from the first day. They may appear late in some cases.
I hope this information has been both informative and helpful for you.
Dr. Rakhi Tayal