I was on the pill for 7 years. I went off in March this year. I went into hospital for a laparoscopy end March. After the operation I had my period end April. I did not have a period end May. I did a home test and it's negative. What else can affect that my period is not regular or must I go do a blood test?

It may be too early to test for pregnancy, even healthy couples can take 12 months or more to get pregnant.

There are 100's of reasons to miss a period,

Wait to see if you miss another month, and if you do, try another pregnancy test