Please I need input!! Sorry it's long.

Okay ladies, I need some help. Me and my SO have been trying to conceive. I need emotional help. All my friends and you ladies are getting lucky but we haven't. I can't help but get a little emotional and think it's my fault that we don't have a baby yet. I had a bad ex boyfriend who forced me to smoke cigarettes, so I'm also wondering that even tho I stopped smoking a year ago, could I have lowered my chances on getting pregnant. Also, what are other ladies coping mechanisms from getting so upset. My period is due in 2 days and I have the tender breasts, really tired, bad gas that won't stop, poop probably 4 times a day, weird taste in my mouth, lower back pain, had cramps on the left side about 2 weeks ago, and really moody and irritable. I feel like these are pregnancy symptoms but I had them last month and I got my period, but it only lasted 4 days which is VERY uncommon. So needless to say when my period comes I get so upset. Please help me with advice and how you dealt with the emotional toll it took every month your period came. I'm so desperate for advice.....