Help please

Period started on March 22nd and became extremely light on March 24th then stopped completely on March 26th. I had sex on the 23rd, 25th, and 27th. I started noticing thick white discharge the 28th and on the 29th i wiped and had a tiny spec of light pink blood, it wasn’t a lot but enough that I could see it. Now I have had mild cramps off and on all day.. what could be going in. This has never happened to me... please someone help me