My period is 3 weeks late done two test pregnancy tests both negative!

I have a tender, dull ache lower pelvic area. Sometimes if I stretch too much it hurts.
Slight lower back ache and really tired.

Have been pregnant in the passed but suffered miscarrage and had same symptoms but never had negative result!

I have been trying for a baby for a year could I be pregnant or could there be another cause I am not stressed or anything by the way!

Help!:confused:

Make an appointment and have a blood test done.