TMI discharge pictures

Okay I am sorry I know nobody wants to see this but I am worried.So I get my periods really regular usually a good 5-7day period. Well I started my period and it was extremely different. I started my period June 19 and it was so light and it literally ended the next day! I gave birth to twins in September and maybe my body is just different but I have been getting regular periods since December 13 last year every 28 days I track.

The first picture is what my period started like and the next picture is today and it’s not my fertile or ovulation window. What could this discharge be? I might sound stupid but it’s just really different my body is regular and i just feel off. There is no smell at all either and I took a pregnancy test and it said negative I just don’t know what is happening. I have been so tired it’s not even funny and lots of headaches it could be coincidence but I am scared I am pregnant