pregnant or pmt

So I have been having what I'm hoping are pregnancy symptoms for the last few days. My cycle is normally 26-28 days long so I'm currently on day 22 of my cycle. I've been having pinching like pains in my left side for the last few days as well as tender breasts but this comes and goes my husband even commented on the fact my breasts felt harder than normal. I am feeling tired a lot and finding it harder than normal to get up in the mornings. Then today I started to feel very sick and even dry heaved a few times. I know this is probably too early to tell but I'm driving myself crazy because we have been trying for so long. Anyone any insight as to if this is all in my head. Thanks in advance xx