Thought it was easier the second time around?

We have been trying to get pregnant with our second child now for about 4 months. I thought it was supposed to be easier the second time around ): I’m a healthy person with no medical issues and I monitor my ovulation and all and we have been having sex many times within my fertile window and on my peak fertility days. I’m just getting so upset every time I get my period and wondering if something is wrong. ): I don’t drink alcohol and eat a good balanced diet & I’m nursing my two year old still but only a few times throughout the day and for bedtime but I’m starting to wean her some so it’s been less and less during the day. Idk if my hormones are messed up or what but I’m just in a terrible mood feeling so upset over not being pregnant yet ): any advice?