Implantation spotting??

Charlene • I`m from a small town, and me and my hubby got married march 2013. Hoping for a miracle:) <3
So I was supposed to get my AF a few days ago but honestly it's been irregular and usually comes within 28-35 days so it wasn't alarming. This morning I felt cramps a bit then I had a bit of spotting but nothing since. Me and my husband had sex the night before as well as two nights ago so I'm not sure if this can be implantation bleeding?? Still trying to figure my body out...