Too much pressure and pain today

I started walking miles every night except last night I walked maybe 1 mile only. And me and my husband had sex but last night was pretty rough. And this morning I started eating pineapple (which I hate) and all I feel is slight lower back pain. But I do feel a lot of pressure downward. I feel pressure going down but I also feel it at the top point of my bump. Like if baby is pushing himself down. I'm to term and last appointment I was 1cm and 50 effaced. Is it almost time are these signs ?