What are the chances of pregnancy? I do?

Hello,  I am stuck up with a situation. I would be grateful if you could just guide me as I am little stressed out. I have 10.5 month old daughter( I am still feeding her)  I started with my periods after 7 months post delivery  first time in 26th March 2020. Post that I got on 6th May,1st June and 25th June respectively. On 28th June I had intercourse without protection though precautionary I took ipill on 29th June within 13 hrs of intercourse (1st time in my life till date). On 5th July I suddenly started bleeding that's was just for a day and spotting on 6th July. My period were expected on 20th july according to the 25 days cycle I had in past couple of months. I did home test on 22nd afternoon and 25th Morning which were negative. Do I need to do a test again? What are the chances of pregnancy and why my periods are delayed? I am scared of pregnancy. What should I do? Please help 🙏 thank you In Advance.