Pregnant after iud or not

Regina

Cramping

We've been trying to get pregnant since I got the iud mierna took out on April 15th 2015. I've had alot of left side pain more like cramping sometimes it's the the right. My stomach feels werid in the middle. Sometimes it's hard. I've took pregnancy test n they keep saying negitive.. every ovation test I take is always positve. Could the test be wrong or is it just to early to tell? This will be our 3rd baby once I conceive: