Vaginal bleeding mid cycle

Amanda • Marine Wife • VII.III.MMXIV • MC August 2015 • BFP 8/7/16 Rainbow Due 4/19/17
My LMP was February 5-10 and normally I have regular periods however I miscarried this August and since then my periods have been slightly late and longer. Yesterday, I began my period again and today it's not any lighter. I've never had "2 periods" in one month before and it makes me very worried. I have the cervix/uterus pressure (as I normally do when my period occurs) I'm even more grumpy and tired as if it's my normal period. Again.. 😩 
I'm praying everything is fine but I was wondering if my dietary supplements could cause this? I only took half the dose for about 3 days and I've stopped taking them just incase. My husband comes home in a few months from deployment and I want everything perfect for us to try for our rainbow baby.