Could The Abdomen Cramps And Tiredness Be Due To Pregnancy?

Hi

I came off my pill on he 9th may to try for a baby

I had my period 13th May.

I have not had a period since, which is nearly 5 weeks, I am normally every 28days.

Over the last 2 weeks I have had stomach cramps, like im coming on my period, I have just started to feel tiered and a little bit sick and Ive had more discharge than normal.

I have done a few pregnancy tests but come back negative,

Could i still be pregnant or is it just from coming off my pill?

Thanks