I just don’t know 😞

So I just found out early that I’m pregnant almost 4weeks and I noticed at the beginning of the week I have had some very light CM tinted brown ish and sometimes pinkish not much at all and seems like as the week has progressed I’m seeing just a little more and a little more. Today I notice I have had low back pain and I just went to the bathroom and saw no CM this time but pink on the paper both times I wiped...I never spotted with my son so I’m kinda of nervous seeing this..has this happened to anyone else? Or with baby #2