Should I be worried?! :/

I'm currently 8w5d pregnant. We got our first US last Thursday and everything looked great. Baby had a heart rate of 158. Well, I've been having brownish discharge for about a week and then this morning (3:30 AM), I had super light pink spotting when I wiped. It was enough to scare me but with each wipe, it's got less and less. Checked again about an hour later and there was nothing. Checked again this morning (7:30 AM) and there wasn't any sign of spotting. Should I call my midwife or is this normal? I've had cramping off and on for about 4-5 days now but nothing horrible. This is my 4th pregnancy and I never had anything like this with my other pregnancies which were all completely normal and resulted in perfect, healthy, babies. It's been 6+ years since my last pregnancy. I'm nervous!