seriously worried

Abbie • A.thomas
Hello I was just wondering on what to do. 
I've taken a pregnancy test, two were postive and two were negative. 
My periods a week late, but I've now woken up today with severe cramping, which sometimes dies down, however can go into my legs and lower back, especially my left side of my pelvis. 
I've got quite heavy bleeding along with this too. 
Just wondering, do you think this could be a chemical pregnancy/miscarriage or could I still be pregnant? 
What do you advise I do? I can't go anywhere tomorrow (Tuesday) so the only day i can see someone is Wednesday or this evening. 
I haven't been to the doctors about my pregnancy yet so it hasn't been confirmed, as we were going to take another test Wednesday which would have been a week since my postive. Any ideas as to what's going on? Can it be left or should I go somewhere? Can it wait till Wednesday?