Clot at 5 weeks 1 day

Hi there! I am 5 weeks and 1 day today with my first pregnancy. I just went to the bathroom and noticed this little clot. It’s smaller than a lentil.

I’ve read that brown blood is ok. So I’m hoping for that. My husband and I did have sex last night so I’m praying that is the reason for it? I’ve also had mild cramps on and off for the past week. Is this something to worry about?