Am I pregnant

Ok so back in February my period was over a week and a half late... lighter than normal with no cramping which was really unusual for me. I had been feeling a lot of symptoms by then as well constantly tired going off some of my favourite foods and sore boobs.

I did a pregnancy test it was negative.

The next month my period was a week early and again lighter than normal with no cramping. By now my symptoms had increased with some extras coming in... my allergy to flowers and plants (hayfever) had disappeared and I am a really bad sufferer from about March to the end of September. I did a pregnancy test and again a negative result.

This month I am incredibly bloated and look as if I am a few months pregnant my boobs have gone up a size and I can't even be near some certain smells I used to be ok with. My period was 2 weeks late this time and longer than usual lasting just over a week and nothing like I was before (I used to end up being bed bound my periods were that bad).

My emotions have been all over the show and I'm getting seriously confused coz yet again I have had negative tests.

My mum had negative tests with me and my sister up until she was about 5 months pregnant with me and I'm worried I am following in the same way. I have had to buy new trousers for work as my normal ones are incredibly tight. I haven't changed my diet at all and was losing weight before my periods started changing.

What do I do?