halp plez

I wish I could just be patient and wait until my period but I'm freaking out now and want answers now lol.

My last period was from the 6th to the 14th. I had sex on the 5th, 8th and yesterday lol. Today I've been having a lot of cramping feelings which piqued my interests but just now upon wiping in the potty, (I'm about to get gross lol) my CM was very mucusy and pink and almost resembled implant bleeding..... Right? Or is it too soon for that? I took a pregnancy test this afternoon that came back negative but I feel like it's too early for my HCG levels to be showing up. I already have a 5 month old and a 17 month old so, like, I need to know lol