Sorry it's long.. I'm currently 16 days late today for my period, I've taken 6 home pregnancy tests which were negative and had a urine one and blood test at my gp. My test results for my urine was negative but my bloods haven't come back yet. Ive constantly got stomach cramps, back ache, fatigue, urinating frequently, all the symptoms but my breasts haven't changed, has anyone had this or have any advice as to whether I could be pregnant or not? It's painful waiting for results and not knowing what's going on with my body!

First those are just signs for some women, many will go into second or third months with no signs except missing period.

It is a sign of a very late period, possible infection of some sort.

Pregnancy is just one of them. Assuming you are doing the urine test first thing in the morning with the first urine of the day, at 2 weeks late it will normally show.
** I assume you are counting from the first day you expected the period, not the last day of your period time. But you are still late.