I don’t know if I am pregnant

I have an iud but we had sex without a condom but I don’t know if he cummed or not he said he didn’t but I think he did I a little because I could feel something slowly liquidy go down my leg and it was like way different then me being wet and I don’t know if my iud is in place or not I haven’t checked it out and with my iud I don’t get my period so I still get scared and so I have been constapited and moody and having been eating as much I know that this is might a be stupid thing to say but it’s with pregnancy and i need someone’s help if you don’t think I am not pregnant what else could it be