Im 24 years old and recently got sexually active again. I had my period on 20th jan 2020 and it lasted until 25th jan. I had protected sex on 27th jan. I have a history of irregular periods and I can go for 2 months without menstruating. Its been 3 months and 10 days since I last got my period. I took a home pregnancy test today i.e 9th may 2020 at 1 am and it is negative. That is almost 100 days after I last had sex. What are my chances of pregnancy. I do not have any pregnancy symptoms and I feel absolutely fine. Can I start having primolut n to induce my period? Also. What are the causes of irregular periods? I have been stressed lately as well.