Spotting in early pregnancy

I am 6w2d and have had spotting a few times this week. I had spotting when I was only 4w2d, and my doctor had me go in for bloodwork. First draw my hcg was 49 and 3 days later it was 252, so they were happy. A few days ago, my husband and I had sex, and I spotted a little after, which didn’t really alarm me. I spotted a little bit last night into the morning as well.

My only other symptoms are fatigue, hunger, and mild lower back pain.

I’m just nervous because I didn’t experience this when I was pregnant with my son.

Anyone ever experienced this?