Thanks to everyone for their support.
I did another test today and still says negative

I've been feeling very tired. Still got the cramps. I did notice that when i went to the toilet earlier i did have a bit of a brown discharge (not blood). It was like the sort of discharge you get when the blood part of your period is over and it turns to a brown discharge. (hope that makes sense to somebody, its very hard to explain)
I have had nothing like in the 4 months that we have been trying for a baby. I've always had a propper period every 28 days. If i'm not pregnant i'm worried that something else may be wrong. I've booked the doctors but they cant see me till Friday 27th June. I am so confused with whats going on