late period...

Sooo I had my last period 24th to 30th January... I don't really have a sex drive but my husband and I had unprotected sex on the 5th and 6th of Feb.... it's now March 8th and I've still not had a period since January.  I haven't bought a test yet as I normally buy one, it says negative then I come on my period so I thought I'd carry on waiting but it's now been 6 weeks since my last period. I don't feel any different. The glow tracker only says 2.9% chance of pregnancy on those days so I'm not sure what to think. Any early symptoms I should look out for? My breasts are fine with no tenderness, no change in the colour of my nipples or anything. Just looking for some thoughts and advice really. Thanks Amy xxx