Can I test now

So me and my fiancé been trying for over a year back in April we decided to try pre-seed which actually worked because in May I found out I was pregnant but that ended in an ectopic . The worst day in my life because I always thought I couldn't get pregnant because in all the years of being with my fiancé we never had a pregnancy scare and I been with him for 5yrs now and we only used condoms our first year dating . So after the ectopic we stop using the preseed and we stop actively trying. So the ending of August we started using preseed again off and on . So I got my af on sept 11th and my pd after that was supposed to come oct.9 but it didn't come until the 12th-15th and spotted 16th-17th but it was like and it would start brown then turn red and then it would be brown again. From the 18th-26th we used preseed and on the 27th I was cramping as if my pd was about to come but I'm not sure what that was all about . Can it be ovulation cramps ? Did I miss the time I should have been BD ?? Help