Confused

Af due wed/Thursday of this week I usually get symptoms( sore boobs, cramps) the week of. Well last weekend DH told me my breath smelt like I had been sucking on pennies and then on Monday I tasted metal in my mouth along with the cramps and my boobs would not fit in my bra. And today I was cramping mildly went to the bathroom and there was blood. Just wondering if I could have been implantion or the start of Af? I haven't been back to the bathroom since we were at the fair and I had nothing but I don't feel anything. Makes me say hmmm