I'm scared

I took a pregnancy test five days after my boyfriend cummed  inside me obviously it was a negative. But I've had really sore boobs the past few days and I'm only half way through my cycle so I don't usually feel this bad weeks before my period? I noticed that when I was pregnant before during the first weeks I was very weak and tired and got headaches and a cold/flu and I've got that now I know usually it's nothing but I'm scared as I've had period type cramps aswell