Need help and advice😅 I’m new here!

Cerys

So basically my period have been all over the place for some years now. I have a little boy who will be 3 in may! Me and my partner has been trying for a baby for around 1 1/2 years now. We don’t sleep together every day as we heard that it helps trying to conceive. My period is due tomorrow. We had sex last Wednesday and I had very pale light spotting after. I assumed I had just started my period so used a tampon. On changing the tampon I realised there was nothing there. Today and yesterday I have been in real agony with my stomach, awful period pains but I’m crippling in agony. Hot baths are not helping. I’m being sick and going very light headed. Does anyone know what this could be 😣😢😢