Iud/pregnant? help

I had unprotected sex about 4 weeks ago, he never came in me but yes i know pre cum can get you pregnant too. I have an iud and I’ve had it for about 3 months now. Lately I’ve been very crampy and some spotting and very tired. I don’t know where my cycle is at and i don’t get a period because of the iud. Could i be pregnant or just side effects of the iud being in/cycle?