Think I may b pregnant

Hi everyone my name is Sam I have 2 children 6 and 5 me and my hubby have been ttc for about a month. Mother Nature was meant to hit today but hasn't and I keep getting period type pains not all the time jst every now and then I have a head ache and jst want to sleep and feel nausea every now and then anyway my question is the period type pains are then normal or am I over thinking things if I am I should b 4 weeks pregnant. Thank u in advance