Hello, please tell me how far along I am? My last menstrual period was…

Hello, please tell me how far along I am? My last menstrual period was April 13. Since January my periods started coming two days earlier: if they were on January 21, then February 19, in March they came on the 16th, then in April on the 14th. In May there was no period. On the 7th I did a test that was negative. On the 20th I did one that was positive. My son is 1.5 years old and I am breastfeeding — can I breastfeed during pregnancy?