Missed period & negative test?

So my period usually comes in the 14th-18th day of each month. However i haven’t gotten my period since last month. My last period was on June 18th. I took a pregnancy test on the last week of July and then another one this weekend. But they both cane out negative. Im not on birth control, my husband uses condoms

. We only had sex about 2 times with no condom but it was like for 1 minute then he put the condom on. I now have an 8 month old. But before i was pregnant i would have irregular periods. After having my baby, they became regular. Today i have been having these cramps. Kind of like period cramps but they feel stronger. It would last for like a minute. Is my period late or should i wait another week and take another pregnancy test? I am very active and do intense workouts at the gym so 25% of me is kind of thinking i could be but 75% thinks I’m not because i already got 2 negative test. 🤔🤔🤔