What are the odds

So I had my bloodyshow at my baby shower last weekend and everything was fine I mentioned it to my dr at my appointment she didn't say anything about it. All was ok until 3 days ago after sax ( I know bad idea but I was horny for some reason) and for the past 3 days I haven't been able to sit up or stand up without every thing hurting. My belly always feels tight and the period like cramps only happen when I stand or sit its every now and then when I am laying down. I am 36 weeks and I have called l&d and they are hopeless on the weekends unless your water breaks. So idk what to do.