Needing help

I been on my birth control since the beginning of January I Just restarted using the pill I had a sex December 8 I had a Normal period after that and so I started the pill I just had a period last week even though it wasn’t suppose to start till this week I believe the pill is effecting my period normally when I was taking these I didn’t have period unless I missed a pill which I missed one and that’s why my period came last week but today I was wiping and I noticed a discharge that’s in the picture what is this and why am I having this I can’t be pregnant I took a test and it’s negative Can anybody explain this feeling I’m having and the mood swings and the discharge