Blackmores conceive well gold?

I have just started taking this on day 3 of my cycle which was the last day of my period. I am on day 6 now and experiencing what I would consider medium spotting started this morning. I have never spotted before in my cycles until now - could this be the blackmores vitamin causing this? I was slightly crampy last night and this morning so it makes sense. Anyone else had this side effect with BCWG? Could be completely unrelated but I’m just a little concerned as this is not normal for me.