I'm so irritable today. Not sure y?

Been wanting to just cry. I'm not at home. It's like my brother in sis in law expect me to watch after their kid too. Mine had me up at 3 am and then 6:30 so I barely slept. A 8 year old should want to play right w their cousin. Not this one. She is seriously on my nerves and I'm not sure if my emotions are all over the place. Anyone else feeling this way? 5 days til af and this has never been a symptom and I did just 
Yesterday get a bfp. So I'm all over the place.