Struggling

I just can’t seem to get pregnant. I have an irregular period, which I’m pretty sure has something to do with it and this is all so frustrating. Every time I think I am.. BOOM!!! There goes my period. And it sucks even more because I get his hopes up for nothin. We have a three year old daughter but trying for baby number two, just doesn’t seem to be workin. And I’m back again with what I think is symptoms but a negative test is what will come.