Your thoughts please

So I'm just wondering if anyone has had the same or going through the same I had what I thought was my period normally I last 6 days and quite heavy ..... but this time I've been very light and only been on my period for 4 days.....

(This is not normal for me)

I came off yesterday and today I just feel so awful I feel very sickly and just a massive head ache and just very unwell in my self does anyone no what it could (pregnant) or just generally unwell

Thanks in advance