Spotting at 35 weeks

So I have been having bad pelvic pressure for almost 2 weeks now & REALLY bad back pain today. My fiancé and I had sex this morning and nothing hurt at all, went to the bathroom like 7 times today and nothing. After I came back from shopping around the mall, I went to the bathroom and saw a little bit of blood on the toilet paper, like it was mild spotting. Could that be from just having sex earlier or could this be part of that “bloody show” ?

My fiancé did say “oh wow, you cervix is super low” which it did feel like it when we did it… not sure if that helps? 😅