Concerned12345

I have a few questions here is my situation and questions. I had sex with my boyfriend very early Saturday morning, it is now Sunday very late evening. Well today I woke up and I had what I thought the start of my period although very light. I put on a pad and thought nothing more of it. Next time I went to the bathroom I checked the pad only had a few spots of blood. I thought this to be strange as I usually have heavy period at the beginning. I put on another pad and again when I went to the bathroom I checked the pad and there was no blood. I even wiped down there to see if any blood came out and nothing. All day I have not had any signs (that is bleeding signs) that I have my period. I was sure I was having my period due to a very bad headache and tender breasts, I get this when I am about to have my period or am having it. My period can be like clock work sometimes and then other times it is late. My period was already late when I had sex with my boyfriend and I have not had sex with anyone else. This was our first time going all the way(intercourse) we used a condom although I do know they are not 100% effective, nothing is. I have had sex before so I know this bleeding can't be due to first time having sex as I remember getting spotting when I had sex for the first time. Is it possible to get spotting due to hard sex (meaning very rough) especially a day later? I have had bleeding due to roughness with fingers before and think it's my period but it's not. But I had that right away not a day later.
Are the headaches and sore breast signs of pregnancy and is it too soon to do a pregnancy test? Sometimes i can go a whole month without my period and then get it the first week of the next month. I wouldn't be worrying so much if it hadn't be for the spotting of blood, this concerns me. I am trying not to freak out but my mind is racing.
Any help, suggestions and support would very much be appreciated. I want children some day but am not ready yet!