period is late

Iv been off the pill for 1 month and at the start I had bleeding and period symptoms but i was told that's normal to have after stopping the pill,me and my partner have been trying and yesterday I felt really sick and was having symptoms of feeling like I was pregnant and I took a test and it was negative but I just feel different should I get a blood test to check as could be to early to test pick up? Plus my period is late