Period type dull ache

Hi guys, I was wondering if this meant anything? Past two days I've been having on and off period type dull aches this morning I actually thought AF was coming. I'm a week away from having my period. Saying this though I've felt this way before and had no luck :( has anyone got any advise or anything as to what it could mean? Or if anyone felt this way and become pregnant? I've been txt for 10 months now and have two children who I conceived with so fast. I don't no what's changed I'm so bloody frustrated. Thanks guys