Icky topic in but I'm worried...

I'm almost 8 weeks and so far it's been fine... no problems... but tonight.. I have felt fine all day still do but I have not long since had a BM (everything normal) but since going I have felt like I needed another ... So I went and did one but smaller a small amount but runny but it all came out fast like no effort at all and since then I've had pelvic pressure and just above my bum feels like I need to go again but don't if you know what I mean ? ... I'm concerned something isn't right I'm freaking out any ideas ? suggestions ? Thank you.